[PATCH] InstCombine: extract instead of shuffle when performing vector/array type punning

[David Majnemer]

================
Comment at: lib/Transforms/InstCombine/InstCombineVectorOps.cpp:993
@@ +992,3 @@
+      if (BitCastInst *BC = dyn_cast<BitCastInst>(U))
+        if (BC->hasNUsesOrMore(1))
+          // Only visit bitcasts that weren't previously handled.
----------------
Is this different from `!BC->use_empty()` ?

http://reviews.llvm.org/D7734

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