use the obvious getters

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61893 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Bitcode/Writer/BitcodeWriter.cpp b/lib/Bitcode/Writer/BitcodeWriter.cpp
index b98dab7..ed9d4db 100644
--- a/lib/Bitcode/Writer/BitcodeWriter.cpp
+++ b/lib/Bitcode/Writer/BitcodeWriter.cpp
@@ -831,9 +831,9 @@
     const InvokeInst *II = cast<InvokeInst>(&I);
     Vals.push_back(VE.getAttributeID(II->getAttributes()));
     Vals.push_back(II->getCallingConv());
-    Vals.push_back(VE.getValueID(I.getOperand(1)));      // normal dest
-    Vals.push_back(VE.getValueID(I.getOperand(2)));      // unwind dest
-    PushValueAndType(I.getOperand(0), InstID, Vals, VE); // callee
+    Vals.push_back(VE.getValueID(II->getNormalDest()));
+    Vals.push_back(VE.getValueID(II->getUnwindDest()));
+    PushValueAndType(II->getCalledFunction(), InstID, Vals, VE);
     
     // Emit value #'s for the fixed parameters.
     for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)