Builtins/ARM: __clear_cache doesn't seem to have a consistent prototype, declare

the builtin as void __clear_cache(...) to workaround this, which appears to
match what GCC does.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@108487 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/Basic/BuiltinsARM.def

@@ -15,7 +15,7 @@
 // The format of this database matches clang/Basic/Builtins.def.
 
 // In libgcc
-BUILTIN(__clear_cache, "vc*c*", "")
+BUILTIN(__clear_cache, "v.", "")
 BUILTIN(__builtin_thread_pointer, "v*", "")
 
 // NEON

test/CodeGen/builtins-arm.c

@@ -9,4 +9,4 @@ void f1(char *a, char *b) {
 	__clear_cache(a,b);
 }
 
-// CHECK: call void @__clear_cache
+// CHECK: call {{.*}} @__clear_cache

test/Sema/builtins-arm.c

@@ -0,0 +1,11 @@
+// RUN: %clang_cc1 -triple armv7 -fsyntax-only -verify -DTEST0 %s
+// RUN: %clang_cc1 -triple armv7 -fsyntax-only -verify -DTEST1 %s
+
+#ifdef TEST0
+void __clear_cache(char*, char*);
+#endif
+
+#ifdef TEST1
+void __clear_cache(void*, void*);
+#endif
+