Lei Zhang b3d2867769 [mlir][spirv] Fix shader ABI attribute prefix and add verification
This commit fixes shader ABI attributes to use `spv.` as the prefix
so that they match the dialect's namespace. This enables us to add
verification hooks in the SPIR-V dialect to verify them.

Reviewed By: mravishankar

Differential Revision: https://reviews.llvm.org/D72062
2020-01-03 07:44:27 -05:00
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