trans: Consolidate creating pass manager builders

The LTO pass in the compiler forgot to call the `LLVMRustAddBuilderLibraryInfo`
function and configure other options such as merge_functions, vectorize_slp,
etc. This ended up causing linker errors on MSVC targets because the optimizer
didn't have the right knowledge that some system functions are missing on these
platforms.

This commit consolidates creation of PassManagerBuilder instances to one
function which is then called when needed. This ensures that the pass manager is
always correctly configured with the various target-specific information that
LLVM needs.

Overall, this fixes `-C lto -C opt-level=3` on 32-bit MSVC targets.

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