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[ARC] Improve code generated for i32 ADDC/ADDE and SUBC/SUBE

Authored by marksl on Sep 10 2021, 1:01 PM.

Description

[ARC] Improve code generated for i32 ADDC/ADDE and SUBC/SUBE
This change improves the code generated for long long addition and subtraction

Differential Revision: https://reviews.llvm.org/D109615