Andrew Trick 7c4d15f96a SILModule::isVisibleExternally utility for VarDecls. (#16834) ...

* SILModule::isVisibleExternally utility for VarDecls.

* Fix the SIL parser so it doesn't drop global variable decls.

This information was getting lost in SIL printing/parsing.
Some passes rely on it. Regardless of whether passes should rely on it,
it is totally unacceptable for the SIL passes to have subtle differences
in behavior depending on the frontend mode. So, if we don't want passes
to rely on global variable decls, that needs to be enforced by the API
independent of how the frontend is invoked or how SIL is serialized.

* Use custom DemangleOptions to lookup global variable identifiers.

2018-06-26 12:27:26 -07:00

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