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Reland r346166: [GlobalISel] Refactor the artifact combiner a bit by using…

Description

Reland r346166: [GlobalISel] Refactor the artifact combiner a bit by using MIPatternMatch

It was causing a crash because we were trying to get the definition
of a target register. Fixed the issue by adding a check and added
a test case for that.

Details

Committed
volkanNov 6 2018, 10:31 AM
Parents
rL346250: Disable calls to *_finite and other glibc-only functions on Musl.
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