tree dada5b2274c750ccd8e7f5ad85b13e3922c2cc61
parent b9db480385745a9f42ea3f49a16877cb048960a9
author Colin Cross <ccross@android.com> 1464826184 -0700
committer Colin Cross <ccross@android.com> 1464919772 -0700

Simplify arch target handling

Soong's multi-architecture building has grown complex, with the
combination of HostOrDevice+HostType+Arch necessary to determine how to
build a variant of a module, and three separate mutators to split each
into its variations.

Combine HostOrDevice+HostType into Os, which will be Linux, Darwin,
Windows, or Android.  Store Os+Arch as a single Target.

Change-Id: I92f2e2dac53617d595a35cc285d2bd348baa0fbd