[PATCH] [SeparateConstOffsetFromGEP] garbage-collect intermediate instructions

[Jingyue Wu]

Added a `-gep-reassociate-verify-no-dead-code` flag to detect dead code. This flag is supposed to be used in test only.


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Comment at: test/Transforms/SeparateConstOffsetFromGEP/NVPTX/split-gep.ll:1
@@ -1,2 +1,2 @@
-; RUN: opt < %s -separate-const-offset-from-gep -dce -S | FileCheck %s
+; RUN: opt < %s -separate-const-offset-from-gep -S | FileCheck %s
 
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meheff wrote:
> Should any extra checks be added to verify we're removing dead code?
Good catch! Fixed by cloning `BO` even if it can be reused.

http://reviews.llvm.org/D9096

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