mlir/LogicalResult: move into llvm (#97309)

This patch is part of a project to move the Presburger library into
LLVM.

[mlir] Make the split markers of splitAndProcessBuffer configurable. (#84765)

This allows to define custom splitters, which is interesting for
non-MLIR inputs and outputs to `mlir-translate`. For e

[mlir] Make the split markers of splitAndProcessBuffer configurable. (#84765)

This allows to define custom splitters, which is interesting for
non-MLIR inputs and outputs to `mlir-translate`. For example, one may
use `; -----` as a splitter of `.ll` files. The splitters are now passed
as arguments into `splitAndProcessBuffer`, the input splitter defaulting
to the previous default (`// -----`) and the output splitter defaulting
to the empty string, which also corresponds to the previous default. The
behavior of the input split marker should not change at all; however,
outputs now have one new line *more* than before if there is no splitter
(old: `insertMarkerInOutput = false`, new: `outputSplitMarker = ""`) and
one new line *less* if there is one. The value of the input splitter is
exposed as a command line options of `mlir-translate` and other tools as
an optional value to the previously existing flag `-split-input-file`,
which defaults to the default splitter if not specified; the value of
the output splitter is exposed with the new `-output-split-marker`,
which default to the empty string in `mlir-translate` and the default
splitter in the other tools. In short, the previous usage or omission of
the flags should result in previous behavior (modulo the new lines
mentioned before).

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[mlir] Use StringRef::{starts,ends}_with (NFC)

This patch replaces uses of StringRef::{starts,ends}with with
StringRef::{starts,ends}_with for consistency with
std::{string,string_view}::{starts,end

[mlir] Use StringRef::{starts,ends}_with (NFC)

This patch replaces uses of StringRef::{starts,ends}with with
StringRef::{starts,ends}_with for consistency with
std::{string,string_view}::{starts,ends}_with in C++20.

I'm planning to deprecate and eventually remove
StringRef::{starts,ends}with.

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[mlir] Add `enableSplitting` and `insertMarkerInOutput` options to `splitAndProcessBuffer`

`enableSplitting` simply enables/disables whether we should split
or use the full buffer. `insertMarkerInOu

[mlir] Add `enableSplitting` and `insertMarkerInOutput` options to `splitAndProcessBuffer`

`enableSplitting` simply enables/disables whether we should split
or use the full buffer. `insertMarkerInOutput` toggles if split markers
should be inserted in between prcessed output chunks.

These options allow for merging the duplicate code paths we have
when splitting is optional.

Differential Revision: https://reviews.llvm.org/D128764

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[mlir][NFC] Add a using for llvm::SMLoc/llvm::SMRange to LLVM.h

These are used pervasively during parsing.

Differential Revision: https://reviews.llvm.org/D118291

[mlir] Flag near misses in file splitting

Flags some potential cases where splitting isn't happening and so could result
in confusing results. Also update some test files where there were near misse

[mlir] Flag near misses in file splitting

Flags some potential cases where splitting isn't happening and so could result
in confusing results. Also update some test files where there were near misses
in splitting that seemed unintentional.

Differential Revision: https://reviews.llvm.org/D109636

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Change the error message when `-split-input-file` is used with mlir-opt to make it recognizable by IDEs

By adding the line number of the split point immediately after the file
name (separated by `:`

Change the error message when `-split-input-file` is used with mlir-opt to make it recognizable by IDEs

By adding the line number of the split point immediately after the file
name (separated by `:`) this is recognized by various tool as a proper
location.

Ideally we would want to point to the line of the error, but that would
require some very invasive changes I suspect.

Reviewed By: jpienaar

Differential Revision: https://reviews.llvm.org/D93363

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Mass update the MLIR license header to mention "Part of the LLVM project"

This is an artifact from merging MLIR into LLVM, the file headers are
now aligned with the rest of the project.

Adjust License.txt file to use the LLVM license

PiperOrigin-RevId: 286906740

Let mlir-translate support -split-input-file

Similar to mlir-opt, having a -split-input-file mode is quite useful
in mlir-translate. It allows to put logically related tests in the
same test file fo

Let mlir-translate support -split-input-file

Similar to mlir-opt, having a -split-input-file mode is quite useful
in mlir-translate. It allows to put logically related tests in the
same test file for better organization.

PiperOrigin-RevId: 270805467

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