Walk through personality flags on 32-bit and 64-bit and ensure correct behaviour

[Sonicadvance1]

Not sure exactly how much this matters but we should double check it.

Flags to support:

• UNAME26
  • Needs emulation
• ADDR_NO_RANDOMIZE
  • Already handled in ELFCodeLoader
• FDPIC_FUNCPTRS
  • nop on x86
• MMAP_PAGE_ZERO
  • Allowed but doesn't do anything on x86
• ADDR_COMPAT_LAYOUT
  • Changes allocation to BottomUp instead of top-down
  • Would need emulation
• READ_IMPLIES_EXEC
  • Needs NX support, which we don't have currently
• ADDR_LIMIT_32BIT
  • nop on x86
• SHORT_INODE
  • nop
• WHOLE_SECONDS
  • nop
• STICKY_TIMEOUTS
  • Causes select, pselect, and ppoll to not modify timeout on signal handler interrupt.
  • Passthrough to host kernel makes FEX impl a nop.
• ADDR_LIMIT_3GB
  • Changes the upper limit on mmap from 0xffff_e000 to 0xc000_0000 for 32-bit processes
  • Needs emulation

Personalities:

• PER_LINUX32
  • Changes uname result
  • Needs emulation
• PER_SVR4/3
• PER_SCOSVR3/PER_OSR5
• PER_WYSEV386
• PER_ISCR4
• PER_BSD
• PER_SUNOS
• PER_XENIX
• PER_IRIX32
• PER_IRIXN32
• PER_IRIX64
• PER_RISCOS
• PER_SOLARIS
• PER_UW7
• PER_OSF4
• PER_HPUX
  • nop