Store HH_FIXMES and DECL_HH_FIXMES in exported decls
Summary:
D12877486 demonstrates a situation where we could fail to suppress an error because the HH_FIXME heaps are empty.
D10409458 addressed this by parsing all files containing hot classes on startup, but this regresses server startup time by 3 seconds (~10% for a clean init).
Instead, this diff stores the relevant parts of the HH_FIXMES and DECL_HH_FIXMES heaps in the saved state, ensuring no significant regression in startup time.
Reviewed By: dabek
Differential Revision:
D12887980
fbshipit-source-id:
7847cc572b18bff3f8708c466d00426e3da4d5d9