Rename clang to clang-cc.

Tests and drivers updated, still need to shuffle dirs.

llvm-svn: 67602
diff --git a/clang/test/CodeGen/struct-copy.c b/clang/test/CodeGen/struct-copy.c
index a45e37a..62c29ab 100644
--- a/clang/test/CodeGen/struct-copy.c
+++ b/clang/test/CodeGen/struct-copy.c
@@ -1,4 +1,4 @@
-// RUN: clang -emit-llvm %s -o - | grep 'call.*llvm.memcpy'
+// RUN: clang-cc -emit-llvm %s -o - | grep 'call.*llvm.memcpy'
 struct x { int a[100]; };