Commit the platform definition and build script work necessary to
cross-compile for arm64_32.
arm64_32 is a variant of AARCH64 that supports an ILP32 architecture.
The *-simulator target triples have been used consistently in tools for
several years to indicate simulator targets. Stop inferring the
simulator part, rdar://problem/35810403.
The *-simulator target triples have been used consistently in tools for
several years to indicate simulator targets. Stop inferring the
simulator part, rdar://problem/35810403.
When loading a module supporting multiple targets, the module loader now looks for a file named with a normalized version of the target triple first, and only falls back to the architecture name if the normalized triple is not found.
