Add -mcpu=cortex-a9-mp. It's cortex-a9 with MP extension. rdar://8648637.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129774 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARM.td b/lib/Target/ARM/ARM.td
index 133af31..745d31d 100644
--- a/lib/Target/ARM/ARM.td
+++ b/lib/Target/ARM/ARM.td
@@ -187,6 +187,8 @@
                                     [ArchV7A, ProcA8]>;
 def : Processor<"cortex-a9",        CortexA9Itineraries,
                                     [ArchV7A, ProcA9]>;
+def : Processor<"cortex-a9-mp",     CortexA9Itineraries,
+                                    [ArchV7A, ProcA9, FeatureMP]>;
 
 // V7M Processors.
 def : ProcNoItin<"cortex-m3",       [ArchV7M]>;