Make BitcodeReader::parseIdentificationBlock() robust to EOF

This method is particular: it iterates at the top-level and does
not have an enclosing block.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@286394 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed