Rollup of 10 pull requests

[matthiaskrgr]

Successful merges:

• ports the compiler test cases to new rust_intrinsic format #138364 (ports the compiler test cases to new rust_intrinsic format)
• add naked_functions_target_feature unstable feature #138570 (add naked_functions_target_feature unstable feature)
• [bootstrap] Use llvm_runtimes for compiler-rt #138623 ([bootstrap] Use llvm_runtimes for compiler-rt)
• Autodiff cleanups #138627 (Autodiff cleanups)
• tests: accept some noise from LLVM 21 in symbols-all-mangled #138669 (tests: accept some noise from LLVM 21 in symbols-all-mangled)
• Improve bootstrap git modified path handling #138706 (Improve bootstrap git modified path handling)
• Update GCC submodule #138709 (Update GCC submodule)
• Add an attribute that makes the spans from a macro edition 2021, and fix pin on edition 2024 with it #138717 (Add an attribute that makes the spans from a macro edition 2021, and fix pin on edition 2024 with it)
• Use explicit cpu in some asm and codegen tests. #138721 (Use explicit cpu in some asm and codegen tests.)
• Update compiler-builtins to 0.1.152 #138728 (Update compiler-builtins to 0.1.152)

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