enhance sourcemgr to detect various UTF BOM's and emit a fatal error
about it instead of producing tons of garbage from the lexer.

It would be even better for sourcemgr to dynamically transcode (e.g.
from UTF16 -> UTF8).


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@101924 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed