[llvm] [AMDGPU] Enable copy from VCC to SHARED_BASE. (PR #164138)

[via llvm-commits]

carlobertolli wrote:

I ran it through the debugger looking at what happens in verifyInstruction in the same file. Both copies from VCC to SHARED_BASE and from SHARED_BASE to VCC get out at

4971      if (SIInstrInfo::isGenericOpcode(Opcode))
(gdb)
4972        return true;

There is no verification done on the src and dst registers if you get out of the function this early.

https://github.com/llvm/llvm-project/pull/164138