Fix PR3075, __builtin_stdarg_start being misprototyped. This affects netbsd headers.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@59419 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/AST/Builtins.def

@@ -118,7 +118,7 @@ BUILTIN(__builtin___CFStringMakeConstantString, "FC*cC*", "nc")
 BUILTIN(__builtin_va_start, "va&.", "n")
 BUILTIN(__builtin_va_end, "va&", "n")
 BUILTIN(__builtin_va_copy, "va&a", "n")
-BUILTIN(__builtin_stdarg_start, "va&a", "n")
+BUILTIN(__builtin_stdarg_start, "va&.", "n")
 BUILTIN(__builtin_bzero, "vv*z", "n")
 BUILTIN(__builtin_memcpy, "v*v*vC*z", "n")
 BUILTIN(__builtin_memmove, "v*v*vC*z", "n")

test/Sema/varargs.c

@@ -25,3 +25,12 @@ void f3(float a, ...)
     __builtin_va_start(ap, a);
     __builtin_va_start(ap, (a));
 }
+
+
+// stdarg: PR3075
+void f4(const char *msg, ...) {
+ __builtin_va_list ap;
+ __builtin_stdarg_start((ap), (msg));
+ __builtin_va_end (ap);
+}
+