clang -cc1: Rename -mcpu to -target-cpu to match other target options and not alias driver/backend option.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@91671 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/clang/Driver/CC1Options.td b/include/clang/Driver/CC1Options.td
index a7db9a8..0d765a3 100644
--- a/include/clang/Driver/CC1Options.td
+++ b/include/clang/Driver/CC1Options.td
@@ -20,8 +20,8 @@
 
 def target_abi : Separate<"-target-abi">,
   HelpText<"Target a particular ABI type">;
-def mcpu : Separate<"-mcpu">,
-  HelpText<"Target a specific cpu type ('-mcpu help' for details)">;
+def target_cpu : Separate<"-target-cpu">,
+  HelpText<"Target a specific cpu type">;
 def target_feature : Separate<"-target-feature">,
   HelpText<"Target specific attributes">;
 def triple : Separate<"-triple">,