bcanalyzer: Rewrite all the METADATA_ codes

Add all the new `Metadata` codes since LLVM 3.6, and at the same time
follow the precedent set in other blocks by removing the `METADATA_`
prefix from the string output.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241016 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed