Duplicated code is bad.  At least make it consistent.

The getARMTargetCPU and getLLVMArchSuffixForARM functions exist in both
Toolchain.cpp and Tools.cpp.  This stuff needs a thorough overhaul.  In the
meantime, this patch at least makes them consistent.  One version had been
converted to use StringSwitch, and the other version had new Cortex M-series
processors added.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@153202 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/Tools.cpp b/lib/Driver/Tools.cpp
index c38767d..bd65d6a 100644
--- a/lib/Driver/Tools.cpp
+++ b/lib/Driver/Tools.cpp
@@ -483,6 +483,8 @@
     .Cases("arm1176jzf-s",  "mpcorenovfp",  "mpcore", "v6")
     .Cases("arm1156t2-s",  "arm1156t2f-s", "v6t2")
     .Cases("cortex-a8", "cortex-a9", "v7")
+    .Case("cortex-m3", "v7m")
+    .Case("cortex-m0", "v6m")
     .Default("");
 }