[AMDGPU] Prevent sequences of non-instructions disrupting GCNHazardRecognizer wait state counting
Summary:
This fixes a bug where a large number of implicit def instructions can fill the GCNHazardRecognizer lookahead buffer causing required NOPs to not be inserted.
Reviewers: nhaehnle, arsenm
Reviewed By: arsenm
Subscribers: sheredom, kzhuravl, jvesely, wdng, yaxunl, dstuttard, tpr, t-tye, llvm-commits
Differential Revision: https://reviews.llvm.org/D51726
Change-Id: Ie75338f94de704ee5816b05afd0c922c6748a95b
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@341798
91177308-0d34-0410-b5e6-
96231b3b80d8
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