Clean up some code to use isZero instead of calling getZExtValue.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@59103 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGStmt.cpp b/lib/CodeGen/CGStmt.cpp
index daad3f5..7f9ca7a 100644
--- a/lib/CodeGen/CGStmt.cpp
+++ b/lib/CodeGen/CGStmt.cpp
@@ -233,7 +233,7 @@
   if (llvm::ConstantInt *CondCst = dyn_cast<llvm::ConstantInt>(BoolCondVal)) {
     // Figure out which block (then or else) is executed.
     const Stmt *Executed = S.getThen(), *Skipped  = S.getElse();
-    if (!CondCst->getZExtValue())
+    if (CondCst->isZero())
       std::swap(Executed, Skipped);
 
     // If the skipped block has no labels in it, just emit the executed block.