The files listed below in src/cpu/x86/vm contain about 33k LOC.  About 47% of the code is for 32-bit x86 and the rest for 64-bit.  It is likely that much of the combined code is redundant, making it likely that we could remove many kLOC from our system.  Removing redundancy would (as always) reduce bugs, such as JDK-8020433.

More specifically, the 32-bit files have 8.6k ULOC (unique lines of code), while the 64-bit files have 9.4k ULOC.  The corpus taken together has 13k ULOC, meaning there are 4.6k ULOC which are identical between the two versions of the code.  This is a large percentage, more than 1/3 of the total ULOC.

Previous work merging files has been largely successful, but was not completed.  This reports requests another attempt at completion.  Filing under "compiler" since (a) much of the code is compiler or interpreter related, and (b) previous work merging has been done in the compiler group.

interp_masm_x86_{32,64}.{h,c}pp
interpreterRT_x86_{32,64}.cpp
interpreter_x86_{32,64}.cpp
jniFastGetField_x86_{32,64}.cpp
metaspaceShared_x86_{32,64}.cpp
runtime_x86_{32,64}.cpp
sharedRuntime_x86_{32,64}.cpp
stubGenerator_x86_{32,64}.cpp
stubRoutines_x86_{32,64}.{h,c}pp
templateInterpreter_x86_{32,64}.cpp
templateTable_x86_{32,64}.{h,c}pp
vtableStubs_x86_{32,64}.cpp