Revert "[flang] Improve debug info for functions." (#90444)

Reverts llvm/llvm-project#90083 due to a test suite failure:
https://lab.llvm.org/buildbot/#/builders/184/builds/11961

```
flang-new:

Revert "[flang] Improve debug info for functions." (#90444)

Reverts llvm/llvm-project#90083 due to a test suite failure:
https://lab.llvm.org/buildbot/#/builders/184/builds/11961

```
flang-new: ../llvm/mlir/lib/IR/Types.cpp:126: unsigned int mlir::Type::getIntOrFloatBitWidth() const: Assertion `isIntOrFloat() && "only integers and floats have a bitwidth"' failed.
```

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[flang] Improve debug info for functions. (#90083)

This PR improves the debug information for functions in the following
ways:

1. Get line number information from FuncOp and remove hard-coded li

[flang] Improve debug info for functions. (#90083)

This PR improves the debug information for functions in the following
ways:

1. Get line number information from FuncOp and remove hard-coded line
numbers.
2. Use proper type for function signature. I have a added a type
converter. Currently, it is very limited but will be enhanced with time.
3. Use de-constructed function name.

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Reapply "[mlir] Mark `isa/dyn_cast/cast/...` member functions depreca… (#90406)

…ted. (#89998)" (#90250)

This partially reverts commit 7aedd7dc754c74a49fe84ed2640e269c25414087.

This change rem

Reapply "[mlir] Mark `isa/dyn_cast/cast/...` member functions depreca… (#90406)

…ted. (#89998)" (#90250)

This partially reverts commit 7aedd7dc754c74a49fe84ed2640e269c25414087.

This change removes calls to the deprecated member functions. It does
not mark the functions deprecated yet and does not disable the
deprecation warning in TypeSwitch. This seems to cause problems with
MSVC.

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Revert "[mlir] Mark `isa/dyn_cast/cast/...` member functions deprecated. (#89998)" (#90250)

This reverts commit 950b7ce0b88318f9099e9a7c9817d224ebdc6337.

This change is causing build failures on

Revert "[mlir] Mark `isa/dyn_cast/cast/...` member functions deprecated. (#89998)" (#90250)

This reverts commit 950b7ce0b88318f9099e9a7c9817d224ebdc6337.

This change is causing build failures on a bot
https://lab.llvm.org/buildbot/#/builders/216/builds/38157

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[mlir] Mark `isa/dyn_cast/cast/...` member functions deprecated. (#89998)

See https://mlir.llvm.org/deprecation and
https://discourse.llvm.org/t/preferred-casting-style-going-forward.

[flang] Remove hardcoded bits from AddDebugInfo. (#89231)

This PR adds following options to the AddDebugInfo pass.

1. IsOptimized flag.
2. Level of debug info to generate.
3. Name of the source

[flang] Remove hardcoded bits from AddDebugInfo. (#89231)

This PR adds following options to the AddDebugInfo pass.

1. IsOptimized flag.
2. Level of debug info to generate.
3. Name of the source file

This enables us to remove the hard coded values from the code. It also
allows us to test the pass with different options. The tests have been
modified to take advantage of that.

The calling convention flag and producer name have also been improved.

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[flang] Rename AddDebugFoundation to AddDebugInfo (NFC) (#89191)

These changes were missed in PR #88526.

[flang] Rename AddDebugFoundation to AddDebugInfo (NFC) (#88526)

As discussed in PR 86939, this PR renames the pass and updates the
references. The actual changes for debug info will come in separa

[flang] Rename AddDebugFoundation to AddDebugInfo (NFC) (#88526)

As discussed in PR 86939, this PR renames the pass and updates the
references. The actual changes for debug info will come in separate PRs.

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