Use bitset for demangled_hash_languages
I noticed that objfile_per_bfd_storage::demangled_hash_languages is a
std::vector, which seemed quite large for something that,
fundamentally, can be represented as a bitset. This patch
reimplements it as a std::bitset.
gdb/ChangeLog
2019-03-15 Tom Tromey <tom@tromey.com>
* objfiles.h (struct objfile_per_bfd_storage)
<demangled_hash_languages>: Now a bitset.
* minsyms.c (add_minsym_to_demangled_hash_table): Update.
(lookup_minimal_symbol): Update.
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