Update tests to use %clang instead of 'clang', and forcibly disable use of '
clang ' or ' clang -cc1 ' or ' clang-cc ' in test lines (by substituting them to
garbage).

llvm-svn: 91460
diff --git a/clang/test/Preprocessor/macro-multiline.c b/clang/test/Preprocessor/macro-multiline.c
index 9f24ae8..df7c40a 100644
--- a/clang/test/Preprocessor/macro-multiline.c
+++ b/clang/test/Preprocessor/macro-multiline.c
@@ -1,4 +1,4 @@
-// RUN: clang -E %s "-DX=A
+// RUN: %clang -E %s "-DX=A
 // RUN: THIS_SHOULD_NOT_EXIST_IN_THE_OUTPUT" > %t
 // RUN: grep "GOOD: A" %t
 // RUN: not grep THIS_SHOULD_NOT_EXIST_IN_THE_OUTPUT %t