[llvm] [GlobalISel] Combine [a, s, z]ext of undef into 0 or undef (PR #117439)

[Amara Emerson via llvm-commits]

Thorsten =?utf-8?q?Schütt?= <schuett at gmail.com>,
Thorsten =?utf-8?q?Schütt?= <schuett at gmail.com>
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In-Reply-To: <llvm.org/llvm/llvm-project/pull/117439 at github.com>


aemerson wrote:

> The title of this PR is `Combine [a,s,z]ext of undef into 0 or undef `. The task was to combine the three ext ops with undef and integrate them with the existing `cast_combines`.

Then change the title to reflect what it's actually doing, which is just sext and zext.

https://github.com/llvm/llvm-project/pull/117439