[PATCH] Canonicalize addrspacecast ConstExpr between different pointer types

[Matt Arsenault]

================
Comment at: lib/IR/Constants.cpp:1708-1709
@@ +1707,4 @@
+    Type *MidTy = PointerType::get(DstElemTy, SrcScalarTy->getAddressSpace());
+    if (DstTy->isVectorTy()) // Handle vectors of pointers.
+      MidTy = VectorType::get(MidTy, DstTy->getVectorNumElements());
+    C = getBitCast(C, MidTy);
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This is a good place to use dyn_cast<VectorType> instead of checking for a vector and then cast<> inside of the getVectorNumElements

http://reviews.llvm.org/D4138