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Add faster DAC EnumMemoryRegion option with less memory usage (#74300) (
#74464) Issue: #72148 Instead of drilling down into all the individual MT/MD/EEClass, etc. data structures, add the LoaderAllocator/LoaderHeaps regions directly. Add new CLRDATA_ENUM_MEM_HEAP2 flag for the fast path. To reduce risk of incomplete core dumps this is enabled by the COMPlus_EnableFastHeapDumps env var. This env var is only looked at by the Linux/MacOS createdump. It is currently ignored on Windows. The new HEAP2 flag is works when passed to the EnumMemoryRegions API on Windows but createdump can't set it because MiniDumpWriteDump in dbghelp.dll loads/calls the DAC API. Fix MacOS dlopen error message
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