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[TypeSystem] Guard the global
ASTSourceMap
with a mutex
s_source_map in ClangExternalASTSourceCommon.cpp is unguarded and therefore can break in multithreaded conditions. This can cause crashes in particular if multiple targets are being set up at once. This patch wraps s_source_map in a function that ensures exclusivity, and makes every user of it use that function instead. <rdar://problem/33429774> lldb crashes after "resume_off" Differential Revision: https://reviews.llvm.org/D35083 llvm-svn: 308993
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