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Add -fclang-abi-compat=latest to a bunch of tests for manglings that changed since v17.
Per discussion on https://reviews.llvm.org/D147655, various vendors use a different default.
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‎clang/test/CodeGenCXX/mangle-concept.cpp

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// RUN: %clang_cc1 -verify -frelaxed-template-template-args -std=c++20 -emit-llvm -triple %itanium_abi_triple -o - %s | FileCheck %s
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// RUN: %clang_cc1 -verify -frelaxed-template-template-args -std=c++20 -emit-llvm -triple %itanium_abi_triple -o - %s -fclang-abi-compat=16 | FileCheck %s --check-prefix=CLANG16
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// RUN: %clang_cc1 -verify -frelaxed-template-template-args -std=c++20 -fclang-abi-compat=latest -emit-llvm -triple %itanium_abi_triple -o - %s | FileCheck %s
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// RUN: %clang_cc1 -verify -frelaxed-template-template-args -std=c++20 -fclang-abi-compat=latest -emit-llvm -triple %itanium_abi_triple -o - %s -fclang-abi-compat=16 | FileCheck %s --check-prefix=CLANG16
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// expected-no-diagnostics
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namespace test1 {

‎clang/test/CodeGenCXX/mangle-exprs.cpp

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// RUN: %clang_cc1 -std=c++11 -emit-llvm %s -o - -triple=x86_64-apple-darwin9 | FileCheck %s
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// RUN: %clang_cc1 -std=c++11 -fclang-abi-compat=latest -emit-llvm %s -o - -triple=x86_64-apple-darwin9 | FileCheck %s
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namespace std {
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typedef decltype(sizeof(int)) size_t;

‎clang/test/CodeGenCXX/mangle-nttp-anon-union.cpp

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// RUN: %clang_cc1 -std=c++20 -emit-llvm %s -o - -triple=x86_64-linux-gnu | FileCheck %s
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// RUN: %clang_cc1 -std=c++20 -emit-llvm %s -o - -triple=x86_64-linux-gnu | llvm-cxxfilt -n | FileCheck %s --check-prefix DEMANGLED
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// RUN: %clang_cc1 -std=c++20 -fclang-abi-compat=latest -emit-llvm %s -o - -triple=x86_64-linux-gnu | FileCheck %s
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// RUN: %clang_cc1 -std=c++20 -fclang-abi-compat=latest -emit-llvm %s -o - -triple=x86_64-linux-gnu | llvm-cxxfilt -n | FileCheck %s --check-prefix DEMANGLED
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template<typename T>
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struct wrapper1 {

‎clang/test/CodeGenCXX/mangle-requires.cpp

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// RUN: %clang_cc1 -verify -std=c++2a -emit-llvm -triple %itanium_abi_triple -o - %s | FileCheck %s
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// RUN: %clang_cc1 -verify -std=c++2a -fclang-abi-compat=latest -emit-llvm -triple %itanium_abi_triple -o - %s | FileCheck %s
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// expected-no-diagnostics
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template <typename T, int N> concept SmallerThan = sizeof(T) < N;

‎clang/test/CodeGenCXX/mangle-template.cpp

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// RUN: %clang_cc1 -verify -Wno-return-type -Wno-main -std=c++11 -emit-llvm -triple %itanium_abi_triple -o - %s | FileCheck %s
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// RUN: %clang_cc1 -verify -Wno-return-type -Wno-main -std=c++20 -emit-llvm -triple x86_64-linux-gnu -o - %s | FileCheck %s --check-prefixes=CHECK,CXX20
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// RUN: %clang_cc1 -verify -Wno-return-type -Wno-main -std=c++11 -fclang-abi-compat=latest -emit-llvm -triple %itanium_abi_triple -o - %s | FileCheck %s
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// RUN: %clang_cc1 -verify -Wno-return-type -Wno-main -std=c++20 -fclang-abi-compat=latest -emit-llvm -triple x86_64-linux-gnu -o - %s | FileCheck %s --check-prefixes=CHECK,CXX20
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// expected-no-diagnostics
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namespace test1 {

‎clang/test/CodeGenCXX/matrix-type.cpp

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// RUN: %clang_cc1 -no-enable-noundef-analysis -fenable-matrix -triple x86_64-apple-darwin %s -emit-llvm -disable-llvm-passes -o - -std=c++17 | FileCheck %s
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// RUN: %clang_cc1 -no-enable-noundef-analysis -fenable-matrix -fclang-abi-compat=latest -triple x86_64-apple-darwin %s -emit-llvm -disable-llvm-passes -o - -std=c++17 | FileCheck %s
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typedef double dx5x5_t __attribute__((matrix_type(5, 5)));
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typedef float fx3x4_t __attribute__((matrix_type(3, 4)));

‎clang/test/OpenMP/tile_codegen.cpp

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// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py UTC_ARGS: --function-signature --include-generated-funcs --replace-value-regex "__omp_offloading_[0-9a-z]+_[0-9a-z]+" "reduction_size[.].+[.]" "pl_cond[.].+[.|,]" --prefix-filecheck-ir-name _
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// Check code generation
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// RUN: %clang_cc1 -verify -triple x86_64-pc-linux-gnu -fopenmp -emit-llvm %s -o - | FileCheck %s --check-prefix=CHECK1
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// RUN: %clang_cc1 -verify -triple x86_64-pc-linux-gnu -fclang-abi-compat=latest -fopenmp -emit-llvm %s -o - | FileCheck %s --check-prefix=CHECK1
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// Check same results after serialization round-trip
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// RUN: %clang_cc1 -verify -triple x86_64-pc-linux-gnu -fopenmp -emit-pch -o %t %s
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// RUN: %clang_cc1 -verify -triple x86_64-pc-linux-gnu -fopenmp -include-pch %t -emit-llvm %s -o - | FileCheck %s --check-prefix=CHECK2
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// RUN: %clang_cc1 -verify -triple x86_64-pc-linux-gnu -fclang-abi-compat=latest -fopenmp -emit-pch -o %t %s
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// RUN: %clang_cc1 -verify -triple x86_64-pc-linux-gnu -fclang-abi-compat=latest -fopenmp -include-pch %t -emit-llvm %s -o - | FileCheck %s --check-prefix=CHECK2
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// expected-no-diagnostics
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#ifndef HEADER

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