Add POWER6 and POWER7 CPU types to the PPC backend.

No functional change; these will be used by upcoming scheduler enhancements.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158313 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/PowerPC/PPCAsmPrinter.cpp b/lib/Target/PowerPC/PPCAsmPrinter.cpp
index fb7aa71..989b5d7 100644
--- a/lib/Target/PowerPC/PPCAsmPrinter.cpp
+++ b/lib/Target/PowerPC/PPCAsmPrinter.cpp
@@ -451,6 +451,8 @@
     "ppc750",
     "ppc970",
     "ppcA2",
+    "power6",
+    "power7",
     "ppc64"
   };