llvm-sb: Remove non-streaming code path and write to file directly.

This avoids a use of the ParseIR/ParseIRFile API in the
sandboxed translator. ParseIR and friends are flexible and
handle LLVM .ll parsing.  We only need to handle bitcode
streams... By removing a use of ParseIR*, LTO will remove
all LLParser-related code.  Helps reduce the size of the
sandboxed LLC by a couple hundred KB.

Also, finally do the cleanup that makes the translator write
to its output file directly, rather than writing to a string
stream before finally writing the output to a file.  May
save a couple of MB of memory (size of the object file)...

BUG= http://code.google.com/p/nativeclient/issues/detail?id=1222

Review URL: https://codereview.chromium.org/12224132

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