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[TableGen] Add the assert statement, step 1

Authored by Paul-C-Anagnostopoulos on Dec 16 2020, 1:25 PM.

Description

[TableGen] Add the assert statement, step 1

Differential Revision: https://reviews.llvm.org/D93911

This first step adds the assert statement and supports it at top level
and in record definitions. Later steps will support it in class
definitions and multiclasses.

Details