[clang] Remove redundant check-prefix=CHECK from tests. NFC.

[mstorsjo]

Looks ok to me, at least for the one file that I wrote.

[mcrosier]

LGTM.

test/CodeGen/aarch64-type-sizes.c

-// RUN: %clang_cc1 -triple aarch64_be-none-linux-gnu -emit-llvm -w -o - %s | FileCheck --check-prefix=CHECK %s
+// RUN: %clang_cc1 -triple aarch64_be-none-linux-gnu -emit-llvm -w -o - %s | FileCheck %s
 // char by definition has size 1
 
 // CHECK: target datalayout = "E-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
 
 int check_short() {
   return sizeof(short);
 // CHECK: ret i32 2
 }

test/CodeGen/aarch64-varargs-ms.c

-// RUN: %clang_cc1 -triple arm64-windows-msvc -emit-llvm -o - %s | FileCheck --check-prefix=CHECK %s
+// RUN: %clang_cc1 -triple arm64-windows-msvc -emit-llvm -o - %s | FileCheck %s
 
 #include <stdarg.h>
 
 int simple_int(va_list ap) {
 // CHECK-LABEL: define i32 @simple_int
   return va_arg(ap, int);
 // CHECK: [[ADDR:%[a-z_0-9]+]] = bitcast i8* %argp.cur to i32*
 // CHECK: [[RESULT:%[a-z_0-9]+]] = load i32, i32* [[ADDR]]
 // CHECK: ret i32 [[RESULT]]
 }

test/CodeGenCXX/implicit-exception-spec.cpp

-// RUN: %clang_cc1 %s -triple=x86_64-linux-gnu -emit-llvm -std=c++11 -o - -fcxx-exceptions -fexceptions | FileCheck -check-prefix=CHECK %s
+// RUN: %clang_cc1 %s -triple=x86_64-linux-gnu -emit-llvm -std=c++11 -o - -fcxx-exceptions -fexceptions | FileCheck %s
 
 struct A {
   A();
   A(const A&);
   A(A&&);
 };
 struct B : virtual A {
   virtual void f() = 0;

test/Index/complete-available.m

 /* The run lines are below, because this test is line- and
    column-number sensitive. */
 void atAvailable() {
   if (@available(macOS 10.10, *)) {
 
   }
   if (__builtin_available(iOS 8, *)) {
   }
 }
 
-// RUN: c-index-test -code-completion-at=%s:4:18 %s | FileCheck -check-prefix=CHECK %s
-// RUN: c-index-test -code-completion-at=%s:7:27 %s | FileCheck -check-prefix=CHECK %s
+// RUN: c-index-test -code-completion-at=%s:4:18 %s | FileCheck %s
+// RUN: c-index-test -code-completion-at=%s:7:27 %s | FileCheck %s
 // CHECK: {TypedText iOS} (40)
 // CHECK: {TypedText iOSApplicationExtension} (40)
 // CHECK: {TypedText macOS} (40)
 // CHECK: {TypedText macOSApplicationExtension} (40)
 // CHECK: {TypedText tvOS} (40)
 // CHECK: {TypedText tvOSApplicationExtension} (40)
 // CHECK: {TypedText watchOS} (40)
 // CHECK: {TypedText watchOSApplicationExtension} (40)

test/Misc/ast-dump-decl.c

-// RUN: %clang_cc1 -triple x86_64-unknown-unknown -ast-dump -ast-dump-filter Test %s | FileCheck -check-prefix CHECK -strict-whitespace %s
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown -ast-dump -ast-dump-filter Test %s | FileCheck -strict-whitespace %s
 // RUN: %clang_cc1 -triple x86_64-unknown-unknown -ast-dump %s | FileCheck -check-prefix CHECK-TU -strict-whitespace %s
 // RUN: %clang_cc1 -fmodules -fmodules-local-submodule-visibility -fmodule-name=X -triple x86_64-unknown-unknown -fmodule-map-file=%S/Inputs/module.modulemap -ast-dump -ast-dump-filter Test %s -DMODULES | FileCheck -check-prefix CHECK -check-prefix CHECK-MODULES -strict-whitespace %s
 
 int TestLocation;
 // CHECK: VarDecl 0x{{[^ ]*}} <{{.*}}:[[@LINE-1]]:1, col:5> col:5 TestLocation
 
 #ifdef MODULES
 #pragma clang module begin X

test/Misc/ast-dump-decl.cpp

-// RUN: %clang_cc1 -std=c++11 -triple x86_64-linux-gnu -fms-extensions -ast-dump -ast-dump-filter Test %s | FileCheck -check-prefix CHECK -strict-whitespace %s
+// RUN: %clang_cc1 -std=c++11 -triple x86_64-linux-gnu -fms-extensions -ast-dump -ast-dump-filter Test %s | FileCheck -strict-whitespace %s
 
 class testEnumDecl {
   enum class TestEnumDeclScoped;
   enum TestEnumDeclFixed : int;
 };
 // CHECK: EnumDecl{{.*}} class TestEnumDeclScoped 'int'
 // CHECK: EnumDecl{{.*}} TestEnumDeclFixed 'int'
 

test/OpenMP/distribute_parallel_for_if_codegen.cpp

 // RUN: %clang_cc1 -verify -fopenmp -fopenmp-version=45 -fopenmp-targets=powerpc64le-ibm-linux-gnu -x c++ -triple %itanium_abi_triple -emit-llvm %s -o - | FileCheck %s
 // RUN: %clang_cc1 -fopenmp -fopenmp-version=45 -fopenmp-targets=powerpc64le-ibm-linux-gnu -x c++ -std=c++11 -triple %itanium_abi_triple -emit-pch -o %t %s
-// RUN: %clang_cc1 -fopenmp -fopenmp-version=45 -fopenmp-targets=powerpc64le-ibm-linux-gnu -x c++ -triple %itanium_abi_triple -std=c++11 -include-pch %t -verify %s -emit-llvm -o - | FileCheck --check-prefix=CHECK %s
+// RUN: %clang_cc1 -fopenmp -fopenmp-version=45 -fopenmp-targets=powerpc64le-ibm-linux-gnu -x c++ -triple %itanium_abi_triple -std=c++11 -include-pch %t -verify %s -emit-llvm -o - | FileCheck %s
 // expected-no-diagnostics
 #ifndef HEADER
 #define HEADER
 
 void fn1();
 void fn2();
 void fn3();
 void fn4();

test/OpenMP/parallel_if_codegen.cpp

 // RUN: %clang_cc1 -verify -fopenmp -fopenmp-version=45 -x c++ -triple %itanium_abi_triple -emit-llvm %s -o - | FileCheck %s
 // RUN: %clang_cc1 -fopenmp -fopenmp-version=45 -x c++ -std=c++11 -triple %itanium_abi_triple -emit-pch -o %t %s
-// RUN: %clang_cc1 -fopenmp -fopenmp-version=45 -x c++ -triple %itanium_abi_triple -std=c++11 -include-pch %t -verify %s -emit-llvm -o - | FileCheck --check-prefix=CHECK %s
+// RUN: %clang_cc1 -fopenmp -fopenmp-version=45 -x c++ -triple %itanium_abi_triple -std=c++11 -include-pch %t -verify %s -emit-llvm -o - | FileCheck %s
 // expected-no-diagnostics
 #ifndef HEADER
 #define HEADER
 
 void fn1();
 void fn2();
 void fn3();
 void fn4();