[PPC][InlineASM] Don't write to source directory in test

Author: d0k

clang/test/CodeGen/PowerPC/inline-asm-constraints-error.c

@@ -1,5 +1,5 @@
-// RUN: %clang_cc1 -emit-llvm -triple powerpc64-ibm-aix-xcoff -verify %s
-// RUN: %clang_cc1 -emit-llvm -triple powerpc-ibm-aix-xcoff -verify %s
+// RUN: %clang_cc1 -emit-llvm-only -triple powerpc64-ibm-aix-xcoff -verify %s
+// RUN: %clang_cc1 -emit-llvm-only -triple powerpc-ibm-aix-xcoff -verify %s
 // This test case exist to test marking the 'a' inline assembly constraint as
 // unsupported because powerpc previously marked it as supported.
 int foo(int arg){