Rename clang to clang-cc.

Tests and drivers updated, still need to shuffle dirs.

llvm-svn: 67602
diff --git a/clang/test/CodeGen/debug-info.c b/clang/test/CodeGen/debug-info.c
index 2ecae9f..0cb01a3 100644
--- a/clang/test/CodeGen/debug-info.c
+++ b/clang/test/CodeGen/debug-info.c
@@ -1,4 +1,4 @@
-// RUN: clang -o %t --emit-llvm -g %s
+// RUN: clang-cc -o %t --emit-llvm -g %s
 
 // PR3023
 void convert(void) {