[llvm] [AMDGPU] Add MachineVerifier check to detect illegal copies from vector register to SGPR (PR #105494)

[Aditi Medhane via llvm-commits]

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+# RUN: not --crash llc -march=amdgcn -mcpu=gfx1200 -run-pass=none -o /dev/null %s 2>&1 | FileCheck %s    
+# REQUIRES: amdgpu-registered-target    
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AditiRM wrote:

Implemented this in new PR and updated in latest commit. 

https://github.com/llvm/llvm-project/pull/105494