Some code is trivially redundant between DFGJITCodeGenerator.cpp & DFGJITCodeGenerator32_64.cpp
Basically move a JSVALUE64 specific code into a new DFGJITCodeGenerator64.cpp, leave common code in DFGJITCodeGenerator.cpp, and remove copies from DFGJITCodeGenerator32_64.cpp.
For some function differences are trivial & make more sense to ifdef individually, and some Operand methods make more sense left in DFGJITCodeGenerator.cpp alongside similar constructors.
Created attachment 109214 [details]
Fixed in r96377