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/lib/Driver/Tools.cpp b/lib/Driver/Tools.cpp
index d3c1b31..b1846b3 100644
--- a/lib/Driver/Tools.cpp
+++ b/lib/Driver/Tools.cpp
@@ -367,7 +367,7 @@
   CmdArgs.push_back(ABIName);
 
   // Set the CPU based on -march= and -mcpu=.
-  CmdArgs.push_back("-mcpu");
+  CmdArgs.push_back("-target-cpu");
   CmdArgs.push_back(getARMTargetCPU(Args));
 
   // Select the float ABI as determined by -msoft-float, -mhard-float, and
@@ -480,7 +480,7 @@
   }
 
   if (CPUName) {
-    CmdArgs.push_back("-mcpu");
+    CmdArgs.push_back("-target-cpu");
     CmdArgs.push_back(CPUName);
   }