[pull] swiftwasm from swift/main #1073
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Use a mutex to protect concurrent access to the signpost map. This fixes nondeterministic crashes in LLDB that appeared after using signposts in the timer implementation. Differential revision: https://reviews.llvm.org/D94285 (cherry picked from commit a4b42c6)
…d8bc9265bbf970c7231271 [llvm] Protect signpost map with a mutex
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