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Summary

  1. [GlobalISel][TableGen] Fix seg fault for zero instruction (details)
Commit 5e9e335a247040a175855f99dbab5957064434ba by mikael.holmen
[GlobalISel][TableGen] Fix seg fault for zero instruction

Tablegen seg faulted when parsing a Pat where the destination part has
no output (zero instruction), due to a register class lookup using
nullptr.

Reviewed By: Paul-C-Anagnostopoulos

Differential Revision: https://reviews.llvm.org/D90829
The file was addedllvm/test/TableGen/GlobalISelEmitter-zero-instr.td
The file was modifiedllvm/utils/TableGen/GlobalISelEmitter.cpp