Rollup merge of #136611 - Zalathar:llvm-underscore, r=workingjubilee

cg_llvm: Remove the `mod llvm_` hack, which should no longer be necessary

This re-export was introduced in https://github.com/rust-lang/rust/commit/c76fc3d804600bc4f19382576aa53269a1ec095b, as a workaround for #53912.

In short, there was/is an assumption in some LLVM LTO code that symbol names would not contain `.llvm.`, but legacy symbol mangling would naturally produce that sequence for symbols in a module named `llvm`.

This was later “fixed” by adding a special case to the legacy symbol mangler in #61195, which detects the sequence `llvm` and emits the `m` in an escaped form. As a result, there should no longer be any need to avoid the module name `llvm` in the compiler itself.

(Symbol mangling v0 avoids this problem by not using `.` in the first place, outside of the “vendor-specific suffix”.)

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