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On second thought, don't bother caching compiled API notes at all. (#120)

Authored by jordan_rose on Sep 6 2017, 4:24 PM.

Description

On second thought, don't bother caching compiled API notes at all. (#120)

Because API notes are always used with modules, and modules are always
cached in PCM files, we don't really achieve any major wins by caching
the API notes information separately. Just rebuild the PCM when the
API notes change, like we do for headers.

The next step is to not use the binary form at all. We don't really
need it, for the same reason we don't need the cache.

rdar://problem/31745420, also a better solution to
https://bugs.swift.org/browse/SR-5806

apple-llvm-split-commit: 13bdf7769e2f34671aae3e7ccec1b8ef2b2a653f
apple-llvm-split-dir: clang/