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/CodeGenCXX/function-template-explicit-specialization.cpp b/clang/test/CodeGenCXX/function-template-explicit-specialization.cpp
index 8ff0655..ed6cf84 100644
--- a/clang/test/CodeGenCXX/function-template-explicit-specialization.cpp
+++ b/clang/test/CodeGenCXX/function-template-explicit-specialization.cpp
@@ -3,11 +3,11 @@
 template<typename T> void a(T);
 template<> void a(int) {}
 
-// CHECK-LABEL: define void @_Z1aIiEvT_
+// CHECK-LABEL: define {{.*}}void @_Z1aIiEvT_
 
 namespace X {
 template<typename T> void b(T);
 template<> void b(int) {}
 }
 
-// CHECK-LABEL: define void @_ZN1X1bIiEEvT_
+// CHECK-LABEL: define {{.*}}void @_ZN1X1bIiEEvT_