[OpenCL] Use -fdeclare-opencl-builtins for some tests

This speeds up the test running times, as the large `opencl-c.h`
header no longer needs to be parsed.

Author: svenvh

clang/test/CodeGenOpenCL/arm-integer-dot-product.cl

@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 %s -triple spir-unknown-unknown -finclude-default-header -cl-std=CL1.2 -emit-llvm -o - -O0 | FileCheck %s
+// RUN: %clang_cc1 %s -triple spir-unknown-unknown -finclude-default-header -fdeclare-opencl-builtins -cl-std=CL1.2 -emit-llvm -o - -O0 | FileCheck %s
 
 #pragma OPENCL EXTENSION cl_arm_integer_dot_product_int8 : enable
 void test_int8(uchar4 ua, uchar4 ub, char4 sa, char4 sb) {

clang/test/CodeGenOpenCL/builtins.cl

@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 %s -finclude-default-header -cl-std=clc++ -fblocks -O0 -emit-llvm -o - -triple "spir-unknown-unknown" | FileCheck %s
+// RUN: %clang_cc1 %s -finclude-default-header -fdeclare-opencl-builtins -cl-std=clc++ -fblocks -O0 -emit-llvm -o - -triple "spir-unknown-unknown" | FileCheck %s
 
 void testBranchingOnEnqueueKernel(queue_t default_queue, unsigned flags, ndrange_t ndrange) {
     // Ensure `enqueue_kernel` can be branched upon.

clang/test/CodeGenOpenCL/size_t.cl

@@ -1,7 +1,7 @@
-// RUN: %clang_cc1 %s -cl-std=CL2.0 -finclude-default-header -emit-llvm -O0 -triple spir-unknown-unknown -o - | FileCheck --check-prefix=SZ32 %s
-// RUN: %clang_cc1 %s -cl-std=CL2.0 -finclude-default-header -emit-llvm -O0 -triple spir64-unknown-unknown -o - | FileCheck --check-prefix=SZ64 --check-prefix=SZ64ONLY %s
-// RUN: %clang_cc1 %s -cl-std=CL2.0 -finclude-default-header -emit-llvm -O0 -triple amdgcn -o - | FileCheck --check-prefix=SZ64 --check-prefix=AMDGCN %s
-// RUN: %clang_cc1 %s -cl-std=CL2.0 -finclude-default-header -emit-llvm -O0 -triple amdgcn---opencl -o - | FileCheck --check-prefix=SZ64 --check-prefix=AMDGCN %s
+// RUN: %clang_cc1 %s -cl-std=CL2.0 -finclude-default-header -fdeclare-opencl-builtins -emit-llvm -O0 -triple spir-unknown-unknown -o - | FileCheck --check-prefix=SZ32 %s
+// RUN: %clang_cc1 %s -cl-std=CL2.0 -finclude-default-header -fdeclare-opencl-builtins -emit-llvm -O0 -triple spir64-unknown-unknown -o - | FileCheck --check-prefix=SZ64 --check-prefix=SZ64ONLY %s
+// RUN: %clang_cc1 %s -cl-std=CL2.0 -finclude-default-header -fdeclare-opencl-builtins -emit-llvm -O0 -triple amdgcn -o - | FileCheck --check-prefix=SZ64 --check-prefix=AMDGCN %s
+// RUN: %clang_cc1 %s -cl-std=CL2.0 -finclude-default-header -fdeclare-opencl-builtins -emit-llvm -O0 -triple amdgcn---opencl -o - | FileCheck --check-prefix=SZ64 --check-prefix=AMDGCN %s
 
 //SZ32: define{{.*}} i32 @test_ptrtoint_private(i8* %x)
 //SZ32: ptrtoint i8* %{{.*}} to i32

clang/test/SemaOpenCL/fp-options.cl

@@ -1,4 +1,3 @@
-// RUN: %clang_cc1 %s -finclude-default-header -triple spir-unknown-unknown -emit-pch -o %t.pch
-// RUN: %clang_cc1 %s -finclude-default-header -cl-no-signed-zeros -triple spir-unknown-unknown -include-pch %t.pch -fsyntax-only -verify
+// RUN: %clang_cc1 %s -finclude-default-header -fdeclare-opencl-builtins -triple spir-unknown-unknown -emit-pch -o %t.pch
+// RUN: %clang_cc1 %s -finclude-default-header -fdeclare-opencl-builtins -cl-no-signed-zeros -triple spir-unknown-unknown -include-pch %t.pch -fsyntax-only -verify
 // expected-no-diagnostics
-

clang/test/SemaOpenCL/printf-format-string-warnings.cl

@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 %s -verify -pedantic -fsyntax-only -cl-std=CL2.0 -finclude-default-header
+// RUN: %clang_cc1 %s -verify -pedantic -fsyntax-only -cl-std=CL2.0 -finclude-default-header -fdeclare-opencl-builtins
 
 // Make sure warnings are produced based on printf format strings.