[clang][IFS][test][NFC] Tightening up clang-ifs tests to use -cc1 more often.
Unless the test is explicitly testing a driver feature if clang
interface stubs I have changed the tests to use %clang_cc1. This should
make some changes I plan to make to the driver job pipeline cause fewer
test changes and breakages.
diff --git a/clang/test/InterfaceStubs/cxx-conversion.cpp b/clang/test/InterfaceStubs/cxx-conversion.cpp
index 70496ce..96425a4 100644
--- a/clang/test/InterfaceStubs/cxx-conversion.cpp
+++ b/clang/test/InterfaceStubs/cxx-conversion.cpp
@@ -1,4 +1,4 @@
-// RUN: %clang -c -o - -emit-interface-stubs %s | FileCheck %s
+// RUN: %clang_cc1 -o - -emit-interface-stubs %s | FileCheck %s
// CHECK: --- !experimental-ifs-v1
// CHECK-NEXT: IfsVersion: 1.0