Update tests to use %clang_cc1 instead of 'clang-cc' or 'clang -cc1'.
 - This is designed to make it obvious that %clang_cc1 is a "test variable"
   which is substituted. It is '%clang_cc1' instead of '%clang -cc1' because it
   can be useful to redefine what gets run as 'clang -cc1' (for example, to set
   a default target).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@91446 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/lit.cfg b/test/lit.cfg
index 1421ec1..c561dd8 100644
--- a/test/lit.cfg
+++ b/test/lit.cfg
@@ -123,4 +123,5 @@
 if not lit.quiet:
     lit.note('using clang: %r' % config.clang)
 config.substitutions.append( (' clang ', ' ' + config.clang + ' ') )
-config.substitutions.append( (' clang-cc ', ' ' + config.clang + ' -cc1 ') )
+config.substitutions.append( ('%clang_cc1', config.clang + ' -cc1') )
+