[llvm] [AMDGPU] Select trunc(srl x, 16) as hi16 subregister on true16 (PR #221960)

[Matt Arsenault via llvm-commits]

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@@ -3549,6 +3549,12 @@ def : GCNPat <
   (EXTRACT_SUBREG $a, sub0)
 >;
 
+let True16Predicate = UseRealTrue16Insts in
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arsenm wrote:

Braces.

Can you move this to be adjacent to the not-true16 version 

https://github.com/llvm/llvm-project/pull/221960