Revert "[RegisterCoalescer] Avoid erasing copy that breaks subranges"
Revert "[RegisterCoalescer] Avoid erasing copy that breaks subranges"

This reverts commit 343e59f009d01b9f20d5872a8080366d07a10fdd.

Change-Id: I9bba5201b54fb9eff973fb4e6adf954793e1f042

GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm