Subzero: Prune unreachable nodes after constructing the Cfg.

src/PNaClTranslator.cpp

Index: src/PNaClTranslator.cpp
diff --git a/src/PNaClTranslator.cpp b/src/PNaClTranslator.cpp
index 799ff94002a0671771194ceb583c5b905598315f..35cdcf7ab6a81134edf4129eec2767de8f9dcd9e 100644
--- a/src/PNaClTranslator.cpp
+++ b/src/PNaClTranslator.cpp
@@ -1920,7 +1920,7 @@ void FunctionParser::ExitBlock() {
     }
     ++Index;
   }
-  Func->computePredecessors();
+  Func->computeInOutEdges();
 }
 
 void FunctionParser::ReportInvalidBinaryOp(Ice::InstArithmetic::OpKind Op,