Jan Kratochvil 32f2d0e564 Protect DWARFCompileUnit::m_die_array by a new mutex ...

Multiple DW_TAG_compile_unit being indexed in a multithreaded way can request
reading of the same DW_TAG_partial_unit.

Unfortunately one cannot detect DWZ file ahead of time to disable such locking
overhead as DWARFCompileUnit::Extract does not read the first DIE which is the
only place one could find early enough if the DWARF file is using any
DW_TAG_partial_unit.

Differential revision: https://reviews.llvm.org/D40470

llvm-svn: 331229

2018-04-30 21:37:30 +00:00

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