Add x86 specific hotpatch flag to rustc

[nebulark]

Implementation for MCP rust-lang/compiler-team#745

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

[nebulark]

@rustbot author

[bors]

☔ The latest upstream changes (presumably #123918) made this pull request unmergeable. Please resolve the merge conflicts.

[apiraino]

Waiting on compiler team to deliberate on the proposal MCP#745

@rustbot label S-waiting-on-team -S-waiting-on-author

[rustbot]

The run-make-support library was changed

cc @jieyouxu

This PR modifies tests/run-make/. If this PR is trying to port a Makefile
run-make test to use rmake.rs, please update the
run-make port tracking issue
so we can track our progress. You can either modify the tracking issue
directly, or you can comment on the tracking issue and link this PR.

cc @jieyouxu

These commits modify compiler targets.
(See the Target Tier Policy.)

[jieyouxu]

I have no clue about hotpatch but the tests have some issues:

[nebulark]

Thanks for the review! The last commits have addressed the requested changes regarding tests.
The PR should now be again in a state to match the current version of the MCP.

[nebulark]

Closing & leaving this as the MCP example.