Split out logic for valid clobbers and valid inline asm registers.

Fixes rdar://9281377


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@134016 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Sema/asm.c b/test/Sema/asm.c
index d8161c8..a3313ca 100644
--- a/test/Sema/asm.c
+++ b/test/Sema/asm.c
@@ -113,3 +113,7 @@
   _Bool b;
   asm volatile ("movb %%gs:%P2,%b0" : "=q"(b) : "0"(0), "i"(5L));
 }
+
+void test12(void) {
+  register int cc __asm ("cc"); // expected-error{{unknown register name 'cc' in asm}}
+}