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[TableGen] Added a function for identification of unsupported opcodes.

Authored by dp on Oct 5 2020, 4:23 AM.

Description

[TableGen] Added a function for identification of unsupported opcodes.

This change implements generation of a function which may be used by a backend to check if a given instruction is supported for a specific subtarget.

Reviewers: sdesmalen

Differential Revision: https://reviews.llvm.org/D88214

Details