[PATCH] Refactor bitcode reader to simplify control.

[Karl Schimpf]

Fix issues raised by jvoung, and remove changes now in http://reviews.llvm.org/D8907.


http://reviews.llvm.org/D8786

Files:
  lib/Bitcode/Reader/BitcodeReader.cpp
  lib/Bitcode/Reader/BitstreamReader.cpp

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