Like HOST_ARCH_*, HOST_OS_* describes the OS the VM is running on, which may be different from the OS the VM is generating code for during AOT compilation.
Currently we conflate the two when emitting AOT as assembly, and we get away with it because Flutter only uses assembly for targeting iOS and one can only target iOS from a Mac, but we expect to use assembly for Android as well so native tools can unwind Dart frames.
R=zra@google.com
Review-Url: https://codereview.chromium.org/2750843003 .
Fuchsia provides pthreads so the linux implementation almost works
except that fuchsia does not (currently) provide the clock_gettime clock
for CLOCK_THREAD_CPUTIME_ID.
Review URL: https://codereview.chromium.org/2154453002 .
Ian McKellar