Merging r287339:

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r287339 | nhaehnle | 2016-11-18 03:55:52 -0800 (Fri, 18 Nov 2016) | 20 lines

AMDGPU: Fix legalization of MUBUF instructions in shaders

Summary:
The addr64-based legalization is incorrect for MUBUF instructions with idxen
set as well as for BUFFER_LOAD/STORE_FORMAT_* instructions.  This affects
e.g.  shaders that access buffer textures.

Since we never actually need the addr64-legalization in shaders, this patch
takes the easy route and keys off the calling convention.  If this ever
affects (non-OpenGL) compute, the type of legalization needs to be chosen
based on some TSFlag.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=98664

Reviewers: arsenm, tstellarAMD

Subscribers: kzhuravl, wdng, yaxunl, tony-tye, llvm-commits

Differential Revision: https://reviews.llvm.org/D26747

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llvm-svn: 288106