I noticed while looking at JIT test failures in LLVM that they don't have an implementation for Cygwin for flushing the instruction cache. I don't see any Cygwin function calling FlushInstructionCache, is there some POSIXy function for this? I don't really want to have to include Windows headers just to get FlushInstructionCache and GetCurrentProcess, risking pulling in a lot of extra definitions.
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