Needed to build on PPC Linux.

llvm-svn: 33352
diff --git a/llvm/lib/Target/PowerPC/PPCSubtarget.h b/llvm/lib/Target/PowerPC/PPCSubtarget.h
index 63efe9e..de17c62 100644
--- a/llvm/lib/Target/PowerPC/PPCSubtarget.h
+++ b/llvm/lib/Target/PowerPC/PPCSubtarget.h
@@ -19,6 +19,9 @@
 
 #include <string>
 
+// GCC #defines PPC on Linux but we use it as our namespace name
+#undef PPC
+
 namespace llvm {
 
 namespace PPC {