[lto] Initialize asmparsers.

Summary:
They are needed for inline asm during LTO.

In particular we hit the report_fatal_error on
llvm/lib/CodeGen/AsmPrinter/AsmPrinterInlineAsm.cpp:138

    LLVM ERROR: Inline asm not supported by this streamer because we don't have an asm parser for this target

Reviewers: ruiu, rafael

Subscribers: Bigcheese, llvm-commits, joker.eph

Differential Revision: http://reviews.llvm.org/D18027

llvm-svn: 263094