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[FPEnv] Add an option to disable strict float node mutating to an normal float…

Authored by pengfei on Thu, Nov 21, 5:17 PM.

Description

[FPEnv] Add an option to disable strict float node mutating to an normal float node

This patch add an option 'disable-strictnode-mutation' to prevent strict
node mutating to an normal node.
So we can make sure that the patch which sets strict-node as legal works
correctly.

Patch by Chen Liu(LiuChen3)

Differential Revision: https://reviews.llvm.org/D70226