tree 427cba289bf0041c8427ec2bae2c772b479df604
parent f66e05a720f74409790bdede308380909f2ecd86
author Arthur Eubanks <aeubanks@google.com> 1617907463 -0700
committer Arthur Eubanks <aeubanks@google.com> 1617915717 -0700

[GVN] Properly invalidate ICF cache when we simplify a value

This fixes a "Cached first special instruction is wrong!" assert.

The assert fires because replacing a value with another can cause an
instruction to no longer be "special" to ICF. In this case,
devirtualization happened, turning an indirect call to a
call to a willreturn function which is no longer special.

Reviewed By: nikic, rnk

Differential Revision: https://reviews.llvm.org/D99977