Revert "Add an index for Module Metadata record in the bitcode"

This reverts commit a0ca6ae2d38339e4ede0dfa588086fc23d87e836.  Revert at
Mehdi's request as it is breaking bots.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@290686 91177308-0d34-0410-b5e6-96231b3b80d8
9 files changed