Remove region from adjustments

It's not necessary to store this region, because it's only used in THIR and MemCat/ExprUse, both of which already basically only deal with erased regions anyways.

Update compiler-builtins to 0.1.136

This includes:

* The license change rust-lang/compiler-builtins#717
* The `libm` submodule update, which also has a license change rust-lang/libm#317
* Re-enabling `math` on i686 UEFI rust-lang/compiler-builtins#715

Fixes: rust-lang/rust#128533

Use protected visibility when building rustc with LLD

rust-lang/compiler-team#782

I wasn't sure about having two commits in a PR, but I figured, at least initially it might make sense to discuss these commits together. Happy to squash, or move the second commit to a separate PR.

I contemplated trying to enable protected visibility for more cases when LLD will be used other than just `-Zlinker-features=+lld`, but that would be more a complex change that probably still wouldn't cover all cases when LLD is used, so went with the simplest option of just checking if the linker-feature is enabled.

r? lqd

Update LLVM to 19.1.3

Closes #131031.

r? nikic

…alfJung

miri: Directly use rustc_abi

I tried to make this a PR to the miri repo for funsies. Ironically, the integration flow meant that it would use a too-old toolchain hash, and I didn't understand the build system there enough to want to manually fiddle with the hashes.