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[mlir] Add support to SourceMgrDiagnosticHandler for filtering FileLineColLocs

Authored by rriddle on Jun 18 2021, 1:30 PM.

Description

[mlir] Add support to SourceMgrDiagnosticHandler for filtering FileLineColLocs

This revision adds support for passing a functor to SourceMgrDiagnosticHandler for filtering out FileLineColLocs when emitting a diagnostic. More specifically, this can be useful in situations where there may be large CallSiteLocs with locations that aren't necessarily important/useful for users.

For now the filtering support is limited to FileLineColLocs, but conceptually we could allow filtering for all locations types if a need arises in the future.

Differential Revision: https://reviews.llvm.org/D103649