Account for calling convention specifiers in function definitions in IR test cases

Several tests wouldn't pass when executed on an armv7a_pc_linux triple
due to the non-default arm_aapcs calling convention produced on the
function definitions in the IR output. Account for this with the
application of a little regex.

Patch by Ying Yi.

llvm-svn: 240971
diff --git a/clang/test/CodeGen/fast-math.c b/clang/test/CodeGen/fast-math.c
index 4a51358..6f98b84 100644
--- a/clang/test/CodeGen/fast-math.c
+++ b/clang/test/CodeGen/fast-math.c
@@ -2,7 +2,7 @@
 float f0, f1, f2;
 
 void foo(void) {
-  // CHECK-LABEL: define void @foo()
+  // CHECK-LABEL: define {{.*}}void @foo()
 
   // CHECK: fadd fast
   f0 = f1 + f2;