Commits on Jul 22, 2015

1. 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.

   

   alexcrichton committed Jul 22, 2015
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