Oliver Stannard 9181785a0c Add backend dignostic printer for unsupported features ...

Re-commit of r258950 after fixing layering violation.

The related LLVM patch adds a backend diagnostic type for reporting
unsupported features, this adds a printer for them to clang.

In the case where debug location information is not available, I've
changed the printer to report the location as the first line of the
function, rather than the closing brace, as the latter does not give the
user any information. This also affects optimisation remarks.

llvm-svn: 259499

2016-02-02 13:52:52 +00:00

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