[llvm] Fix update_analyze_test_checks and add a test to prevent further breakage

Author: LebedevRI

llvm/test/tools/UpdateTestChecks/update_analyze_test_checks/Inputs/basic.ll

@@ -0,0 +1,6 @@
+; RUN: opt -passes='print<scalar-evolution>' < %s -disable-output 2>&1 | FileCheck %s
+
+define i32 @basic(i32 %x, i32 %y) {
+  %r = add i32 %x, %y
+  ret i32 %r
+}

llvm/test/tools/UpdateTestChecks/update_analyze_test_checks/Inputs/basic.ll.expected

@@ -0,0 +1,13 @@
+; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
+; RUN: opt -passes='print<scalar-evolution>' < %s -disable-output 2>&1 | FileCheck %s
+
+define i32 @basic(i32 %x, i32 %y) {
+; CHECK-LABEL: 'basic'
+; CHECK-NEXT:  Classifying expressions for: @basic
+; CHECK-NEXT:    %r = add i32 %x, %y
+; CHECK-NEXT:    --> (%x + %y) U: full-set S: full-set
+; CHECK-NEXT:  Determining loop execution counts for: @basic
+;
+  %r = add i32 %x, %y
+  ret i32 %r
+}

llvm/test/tools/UpdateTestChecks/update_analyze_test_checks/basic.test

@@ -0,0 +1,6 @@
+## Basic test checking that update_analyze_test_checks.py works correctly
+# RUN: cp -f %S/Inputs/basic.ll %t.ll && %update_analyze_test_checks %t.ll
+# RUN: diff -u %t.ll %S/Inputs/basic.ll.expected
+## Check that running the script again does not change the result:
+# RUN: %update_analyze_test_checks %t.ll
+# RUN: diff -u %t.ll %S/Inputs/basic.ll.expected

llvm/test/tools/UpdateTestChecks/update_analyze_test_checks/lit.local.cfg

@@ -0,0 +1,3 @@
+# These tests require opt.
+if 'opt-binary' not in config.available_features:
+    config.unsupported = True

llvm/utils/update_analyze_test_checks.py

@@ -112,6 +112,7 @@ def main():
       run_list = prefix_list,
       flags = type('', (object,), {
             'verbose': args.verbose,
+            'filters': args.filters,
             'function_signature': False,
             'check_attributes': False,
             'replace_value_regex': []}),