[PATCH] Wire up external debug type references in LLVM

[Adrian Prantl]

Hi Eric & David,

this patch implements bare-bones LVM support for external type references as previously discussed in http://reviews.llvm.org/D9612.
This is a necessary prerequisite for bootstrapping the emission of debug info inside modules.

- Add a FlagExternalTypeRef to DICompositeType. External types must have a unique identifier.
- External type references are emitted in the short form DW_AT_type([DW_FORM_ref_sig8]) but the long form with an indirect reference is also supported (see test case for examples).

thanks,
-- adrian

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