[llvm] RenameIndependentSubregs: Add missing sub-range for new IMPLICIT_DEFs (PR #89050)

[Matt Arsenault via llvm-commits]

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+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 4
+# RUN: llc -mtriple=amdgcn--amdpal -mcpu=gfx1010 -start-before=rename-independent-subregs -stop-before=amdgpu-mark-last-scratch-load %s -o - | FileCheck -check-prefix=GCN %s
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+--- |
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arsenm wrote:

This test needs to be reduced, preferably to something which doesn't require an IR or registers section and at most a handful of blocks 

https://github.com/llvm/llvm-project/pull/89050