[llvm] [AMDGPU] Have VCC as a first-class member of the SGPR pool. (PR #173870)

[Matt Arsenault via llvm-commits]

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+// NOTE: Assertions have been autogenerated by utils/update_mc_test_checks.py UTC_ARGS: --version 5
+// RUN: llvm-mc -triple=amdgcn -mcpu=gfx1250 -show-encoding %s | FileCheck -check-prefixes=GFX1250 %s
+// RUN: llvm-mc -triple=amdgcn -mcpu=gfx1250 -show-encoding %s | %extract-encodings | llvm-mc -triple=amdgcn -mcpu=gfx1250 -disassemble -show-encoding | FileCheck --check-prefixes=GFX1250 %s
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arsenm wrote:

Also test older targets? Particularly pre-gfx10 

https://github.com/llvm/llvm-project/pull/173870