Replace preserve-as-comments CodeGen test with driver test

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@276947 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGen/preserve-as-comments.c

-// RUN: %clang_cc1 -S -triple=x86_64-unknown-unknown -fno-preserve-as-comments %s -o - | FileCheck %s --check-prefix=NOASM --check-prefix=CHECK
-// RUN: %clang_cc1 -S %s -triple=x86_64-unknown-unknown -o - | FileCheck %s --check-prefix=ASM --check-prefix=CHECK
-
-// CHECK-LABEL: main
-// CHECK: #APP
-// ASM: #comment
-// NOASM-NOT: #comment
-// CHECK: #NO_APP
-int main() {
-  __asm__("/*comment*/");
-  return 0;
-}

test/Driver/preserve-as-comments.c

+// RUN: %clang -S -fno-preserve-as-comments %s -### 2>&1 | FileCheck %s
+// CHECK: "-fno-preserve-as-comments"