Rename clang to clang-cc.

Tests and drivers updated, still need to shuffle dirs.

llvm-svn: 67602
diff --git a/clang/test/CodeGen/builtin-count-zeros.c b/clang/test/CodeGen/builtin-count-zeros.c
index 5453cb1..374acc4 100644
--- a/clang/test/CodeGen/builtin-count-zeros.c
+++ b/clang/test/CodeGen/builtin-count-zeros.c
@@ -1,4 +1,4 @@
-// RUN: clang -emit-llvm %s -o - | grep 'cttz' | count 2 &&
-// RUN: clang -emit-llvm %s -o - | grep 'ctlz' | count 2
+// RUN: clang-cc -emit-llvm %s -o - | grep 'cttz' | count 2 &&
+// RUN: clang-cc -emit-llvm %s -o - | grep 'ctlz' | count 2
 
 int a(int a) {return __builtin_ctz(a) + __builtin_clz(a);}