Rollup merge of #134437 - onur-ozkan:improve-compiler-build, r=jieyouxu

reduce compiler `Assemble` complexity

`compile::Assemble` is already complicated by its nature (as it handles core internals like recursive building logic, etc.) and also handles half of `LldWrapper` tool logic for no good reason since it should be done in the build step directly.

This change moves it there to reduce complexity of `compile::Assemble` logic.

Author: jieyouxu