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[AMDGPU][MC] Corrected parsing of optional modifiers

Authored by dp on Feb 2 2021, 3:49 AM.

Description

[AMDGPU][MC] Corrected parsing of optional modifiers

Fixed bugs in parsing of "no*" modifiers and improved errors handling.
See https://bugs.llvm.org/show_bug.cgi?id=41282.

Differential Revision: https://reviews.llvm.org/D95675