[WinEH] Rename CatchReturnInst::getParentPad, NFC

Summary:
Rename to getCatchSwitchParentPad, to make it more clear which ancestor
the "parent" in question is.  Add a comment pointing out the key feature
that the returned pad indicates which funclet contains the successor
block.

Reviewers: rnk, andrew.w.kaylor, majnemer

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D16222

llvm-svn: 257933
diff --git a/llvm/lib/CodeGen/WinEHPrepare.cpp b/llvm/lib/CodeGen/WinEHPrepare.cpp
index 886c5f6..281fe93 100644
--- a/llvm/lib/CodeGen/WinEHPrepare.cpp
+++ b/llvm/lib/CodeGen/WinEHPrepare.cpp
@@ -787,7 +787,7 @@
       FixupCatchrets.clear();
       for (BasicBlock *Pred : predecessors(OldBlock))
         if (auto *CatchRet = dyn_cast<CatchReturnInst>(Pred->getTerminator()))
-          if (CatchRet->getParentPad() == FuncletToken)
+          if (CatchRet->getCatchSwitchParentPad() == FuncletToken)
             FixupCatchrets.push_back(CatchRet);
 
       for (CatchReturnInst *CatchRet : FixupCatchrets)
@@ -802,7 +802,7 @@
         bool EdgeTargetsFunclet;
         if (auto *CRI =
                 dyn_cast<CatchReturnInst>(IncomingBlock->getTerminator())) {
-          EdgeTargetsFunclet = (CRI->getParentPad() == FuncletToken);
+          EdgeTargetsFunclet = (CRI->getCatchSwitchParentPad() == FuncletToken);
         } else {
           ColorVector &IncomingColors = BlockColors[IncomingBlock];
           assert(!IncomingColors.empty() && "Block not colored!");