[AMDGPU] Add intrinsics for 16 bit interpolation
Summary:
Added the intrinsics llvm.amdgcn.interp.p1.f16() and
llvm.amdgcn.interp.p2.f16() and related LIT test.
The p1 intrinsic generates code appropriate for both 16 and 32
bank LDS.
Reviewers: #amdgpu, dstuttard, arsenm, tpr
Reviewed By: #amdgpu, arsenm
Subscribers: jvesely, mgorny, arsenm, kzhuravl, wdng, nhaehnle, yaxunl, dstuttard, tpr, t-tye, llvm-commits
Differential Revision: https://reviews.llvm.org/D46754
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@352357
91177308-0d34-0410-b5e6-
96231b3b80d8
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