Add x86 specific hotpatch flag to rustc #124966
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Add unstable ms-hotpatch option to the compiler working similar as /hotpatch in msvc
See: https://learn.microsoft.com/en-us/cpp/build/reference/hotpatch-create-hotpatchable-image?view=msvc-170&viewFallbackFrom=vs-2019
Invoking cargo with 'RUSTFLAGS="-Zhotpatch -C link-arg=-functionpadmin" cargo build --release' creates the desired outcome.
Mostly based on llvm/llvm-project@5af2433
r? @ghost