[llvm-commits] Patch to fix windows compilation warning

[Villmow, Micah]

The following code in BitstreamWriter.h uses a negation on an unsigned value. Windows warns on this.
void EnterBlockInfoBlock(unsigned CodeWidth) {
    EnterSubblock(bitc::BLOCKINFO_BLOCK_ID, CodeWidth);
    BlockInfoCurBID = -1U;
  }

The attached patch fixes it.
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