[PPC][BOLT] Adding factory function

Author: kostasalv

bolt/lib/Target/PowerPC/PPCMCPlusBuilder.cpp

@@ -40,5 +40,13 @@ class PPCMCPlusBuilder : public MCPlusBuilder{
     }
 };
 
+MCPlusBuilder *createPowerPCMCPlusBuilder(const MCInstrAnalysis *Analysis,
+                                          const MCInstrInfo *Info,
+                                          const MCRegisterInfo *RegInfo,
+                                          const MCSubtargetInfo *STI) {
+  return new PPCMCPlusBuilder(Analysis, Info, RegInfo, STI);
+}
+
 } // namespace bolt
-} // namespace llvm
+} // namespace llvm
+