Initial AIX build support.
Initial OS interface in platform-aix.cc.
Use -gxcoff debugging option on AIX.
Add support for AIX.
Define AtomicWord as Atomic32 on AIX.
Test _ARCH_PPC on AIX.
Undef UNKNOWN, FALSE and TRUE leaked into public identifier space
by AIX header.
Define AtomicWord as Atomic32 on AIX.
Configure additional platform sources for AIX.
Add AIX to GuessOS and ppc for GuessArchitecture.
Add AIX to OSes that need d8-posix.cc.
Merge remote-tracking branch 'upstream/master'
Choose available mmap address range for AIX.
32 bit AIX frame alignment is 8 bytes.
Change MAP_ANON to MAP_ANONYMOUS.
Use mprotect() to change mapping protections in CommitRegion
and UnCommitRegion.
Merge remote-tracking branch 'upstream/master'