Saleem Abdulrasool 1ebdc6b129 vim: add missing keyword
`source_filename` was introduced as a keyword in SVN r264884, but the syntax
file was not updated.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@265572 91177308-0d34-0410-b5e6-96231b3b80d8
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