[llvm] [AArch64][GlobalISel] Improve lowering of vector fp16 fptrunc and fpext (PR #163398)

[David Green via llvm-commits]

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@@ -332,6 +332,13 @@ def combine_mul_cmlt : GICombineRule<
   (apply [{ applyCombineMulCMLT(*${root}, MRI, B, ${matchinfo}); }])
 >;
 
+def combine_build_unmerge : GICombineRule<
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davemgreen wrote:

Can we pull this out into a separate patch so we can submit it separately.

https://github.com/llvm/llvm-project/pull/163398