[X86] Add mayLoad flag to FARCALL*m/FARJMP memory instrutions. Add 'm' to the...

[X86] Add mayLoad flag to FARCALL*m/FARJMP memory instrutions. Add 'm' to the end of FARJMP64/FARCALL64 instruction names.

We never codegen them so this doesn't matter in practice. But
sometimes someone comes along and tries to use these flags
for something else. LIke the Load Value Inject inline assembly
handling.