Rename clang to clang-cc.

Tests and drivers updated, still need to shuffle dirs.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@67602 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/private-extern.c b/test/CodeGen/private-extern.c
index 8cf963d..f3ffe54 100644
--- a/test/CodeGen/private-extern.c
+++ b/test/CodeGen/private-extern.c
@@ -1,4 +1,4 @@
-// RUN: clang -emit-llvm -o %t %s &&
+// RUN: clang-cc -emit-llvm -o %t %s &&
 // RUN: grep '@g0 = external hidden constant i32' %t &&
 // RUN: grep '@g1 = hidden constant i32 1' %t