[PATCH] Merge empty landing pads in SimplifyCFG

[Andy Kaylor]

LGTM (with a minor question about debug info intrinsics)


================
Comment at: lib/Transforms/Utils/SimplifyCFG.cpp:4462
@@ +4461,3 @@
+  if (LandingPadInst *LPad = dyn_cast<LandingPadInst>(I)) {
+    for (++I; isa<DbgInfoIntrinsic>(I); ++I) {}
+    if (I->isTerminator() &&
----------------
If I'm reading this right these debug intrinsics just get thrown away if a merge is performed.  Do they not contain anything that might be different from the corresponding debug intrinsics in the potential merge block?

http://reviews.llvm.org/D8297

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