MSVC seems to use (void) in __FUNCSIG__ for a zero-parameter function even in C++. Follow suit.

llvm-svn: 291489
diff --git a/clang/test/CodeGenCXX/funcsig.cpp b/clang/test/CodeGenCXX/funcsig.cpp
index c064946..16e5f7e 100644
--- a/clang/test/CodeGenCXX/funcsig.cpp
+++ b/clang/test/CodeGenCXX/funcsig.cpp
@@ -13,13 +13,12 @@
   printf("__FUNCSIG__ %s\n\n", __FUNCSIG__);
 }
 // CHECK-C:   @"\01??_C@_0BL@IHLLLCAO@void?5__cdecl?5funcNoProto?$CI?$CJ?$AA@" = linkonce_odr unnamed_addr constant [27 x i8] c"void __cdecl funcNoProto()\00"
-// CHECK-CXX: @"\01??_C@_0BL@IHLLLCAO@void?5__cdecl?5funcNoProto?$CI?$CJ?$AA@" = linkonce_odr unnamed_addr constant [27 x i8] c"void __cdecl funcNoProto()\00"
+// CHECK-CXX: @"\01??_C@_0BP@PJOECCJN@void?5__cdecl?5funcNoProto?$CIvoid?$CJ?$AA@" = linkonce_odr unnamed_addr constant [31 x i8] c"void __cdecl funcNoProto(void)\00"
 
 void funcNoParams(void) {
   printf("__FUNCSIG__ %s\n\n", __FUNCSIG__);
 }
-// CHECK-C:   @"\01??_C@_0CA@GBIDFNBN@void?5__cdecl?5funcNoParams?$CIvoid?$CJ?$AA@" = linkonce_odr unnamed_addr constant [32 x i8] c"void __cdecl funcNoParams(void)\00"
-// CHECK-CXX: @"\01??_C@_0BM@GDFBOAEE@void?5__cdecl?5funcNoParams?$CI?$CJ?$AA@" = linkonce_odr unnamed_addr constant [28 x i8] c"void __cdecl funcNoParams()\00"
+// CHECK: @"\01??_C@_0CA@GBIDFNBN@void?5__cdecl?5funcNoParams?$CIvoid?$CJ?$AA@" = linkonce_odr unnamed_addr constant [32 x i8] c"void __cdecl funcNoParams(void)\00"
 
 void freeFunc(int *p, char c) {
   printf("__FUNCSIG__ %s\n\n", __FUNCSIG__);
@@ -27,6 +26,11 @@
 // CHECK: @"\01??_C@_0CD@KLGMNNL@void?5__cdecl?5freeFunc?$CIint?5?$CK?0?5cha@" = linkonce_odr unnamed_addr constant [{{.*}} x i8] c"void __cdecl freeFunc(int *, char)\00"
 
 #ifdef __cplusplus
+void funcVarargs(...) {
+  printf("__FUNCSIG__ %s\n\n", __FUNCSIG__);
+}
+// CHECK-CXX: @"\01??_C@_0BO@BOBPLEKP@void?5__cdecl?5funcVarargs?$CI?4?4?4?$CJ?$AA@" = linkonce_odr unnamed_addr constant [30 x i8] c"void __cdecl funcVarargs(...)\00"
+
 struct TopLevelClass {
   void topLevelMethod(int *, char);
 };