[CodeGen][NVPTX] Add a TRI function get the Dwarf register number for a virtual register. (#129017) NVPTX needs to be able to get the Dwarf register number for a virtual register. The interface we have for this today is on MCRegisterInfo and take a MCRegister argument. It shouldn't be legal to convert a Register containing a virtual register to an MCRegister. This patch adds a getDwarfRegNumForVirtReg function that takes a Register to TRI and splits the NVPTX override of getDwarfRegNum.
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