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[AST] Fix certain consteval assignment and comma operator issues with fixed…

Authored by ebevhan on Jan 22 2020, 5:53 AM.

Description

[AST] Fix certain consteval assignment and comma operator issues with fixed-point types.

Summary:
Assignment and comma operators for fixed-point types were being constevaled as other
binary operators, but they need special treatment.

Reviewers: rjmccall, leonardchan, bjope

Subscribers: cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D73189