improve test readability

Signed-off-by: Sarnie, Nick <[email protected]>

Author: sarnex

clang/test/AST/ast-dump-type-callingconv.cpp

@@ -1,11 +1,11 @@
 // RUN: %clang_cc1 -triple aarch64 -ast-dump -ast-dump-filter foo %s \
 // RUN: | FileCheck --strict-whitespace %s
 
-// CHECK: {{foo1 'void \(\) __attribute__\(\(device_kernel\)\)'$}}
+// CHECK: foo1 'void () __attribute__((device_kernel))'{{$}}
 void foo1() __attribute__((device_kernel));
 
-// CHECK: {{foo2 'void \(\) __attribute__\(\(aarch64_vector_pcs\)\)'$}}
+// CHECK: foo2 'void () __attribute__((aarch64_vector_pcs))'{{$}}
 void foo2()  __attribute__((aarch64_vector_pcs));
 
-// CHECK: {{foo3 'void \(\) __attribute__\(\(aarch64_sve_pcs\)\)'$}}
+// CHECK: foo3 'void () __attribute__((aarch64_sve_pcs))'{{$}}
 void foo3()  __attribute__((aarch64_sve_pcs));