iOS arm64 support coming along nicely

[Dan Olson via digitalmars-d-ldc]

Dan Olson <gorox at comcast.net> writes:

> Next task is to fix up the C ABI as iOS calling convention [2] is a
> variation on AAPCS64.  Started with LDC's gen/abi-aarch64.cpp, but a
> couple files of phobos ICE in LLVM vararg code, which I expect is due to
> iOS variation.

All of phobos builds now for arm64 and writeln("hello world") works.
Haven't tried much else yet.  Getting the C ABI compatible with clang
for struct passing will take some more work though.
-- 
Dan