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[AArch64][FPenv] Update chain of int to fp conversion

Authored by dnsampaio on Feb 14 2020, 9:05 PM.

Description

[AArch64][FPenv] Update chain of int to fp conversion

Summary:
When using strict fp, it is required to update the
chain when performing integer type promotion of a
operand to a integer to floating point conversion.

Reviewers: craig.topper, john.brawn

Reviewed By: craig.topper

Subscribers: kristof.beyls, hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D74597