[PATCH] [NFCI] Change RewriteStatepointsForGC to a ModulePass.

[Sanjoy Das]

In http://reviews.llvm.org/D10104#180611, @pgavlin wrote:

> LGTM as well. Which later change depends on this?


http://reviews.llvm.org/D10105


http://reviews.llvm.org/D10104

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