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Fix available memory extraction on Linux (dotnet/coreclr#26764)
* Fix available memory extraction on Linux The GlobalMemoryStatusEx in PAL is returning number of free physical pages in the ullAvailPhys member. But there are additional pages that are allocated as buffers and caches that get released when there is a memory pressure and thus they are effectively available too. This change extracts the available memory on Linux from the /proc/meminfo MemAvailable row, which is reported by the kernel as the most precise amount of available memory. Commit migrated from dotnet/coreclr@859f464
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