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This is the last of the series of CLs to add LLD-LTO string literal
support to Supersize by parsing BC .o files when LLD-LTO is enabled.
Details:
- Add ResolveStringPieces() (alongside ResolveStringPiecesIndirect()) to
  process strings extracted from BC files.
- Check each .o files processed to decide if it's a BC file.
- nm is still used to process all .o files (including BC files) to
  extract symbols.
- Any BC .o files found are processed by the new code that calls
  llvm-bcanalyzer. This provides flexibility since some .o files may
  still be ELF.

Bug: 723798
Change-Id: I5b7d1db9f91a2cd6749fe4c57595ac46eee664a8
Reviewed-on: https://chromium-review.googlesource.com/1130006Reviewed-by: Samuel Huang <huangs@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Commit-Queue: Samuel Huang <huangs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577622}