[TableGen] Add assert to validate `Objects` list for `HwModeSelect` (#123794)

- Bail out of TableGen if any asserts fail before running the backend.
- Add asserts to validate that the `Objects` an

[TableGen] Add assert to validate `Objects` list for `HwModeSelect` (#123794)

- Bail out of TableGen if any asserts fail before running the backend.
- Add asserts to validate that the `Objects` and `Modes` lists for
various `HwModeSelect` subclasses are of same length.
- Eliminate equivalent check in CodeGenHWModes.cpp

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[TableGen] Use std::pair instead of std::make_pair. NFC. (#123174)

Also use brace initialization and emplace to avoid explicitly
constructing std::pair, and the same for std::tuple.

[TableGen] Change `getValueAsListOfDefs` to return const pointer vector (#110713)

Change `getValueAsListOfDefs` to return a vector of const Record
pointer, and remove `getValueAsListOfConstDefs` th

[TableGen] Change `getValueAsListOfDefs` to return const pointer vector (#110713)

Change `getValueAsListOfDefs` to return a vector of const Record
pointer, and remove `getValueAsListOfConstDefs` that was added as a
transition aid.

This is a part of effort to have better const correctness in TableGen
backends:


https://discourse.llvm.org/t/psa-planned-changes-to-tablegen-getallderiveddefinitions-api-potential-downstream-breakages/81089

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[LLVM][TableGen] Use const record pointers in TableGen/Common files (#109467)

Use const record pointers in TableGen/Common files.

This is a part of effort to have better const correctness in Tabl

[LLVM][TableGen] Use const record pointers in TableGen/Common files (#109467)

Use const record pointers in TableGen/Common files.

This is a part of effort to have better const correctness in TableGen
backends:


https://discourse.llvm.org/t/psa-planned-changes-to-tablegen-getallderiveddefinitions-api-potential-downstream-breakages/81089

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[TableGen] Migrate CodeGenHWModes to use const RecordKeeper (#107851)

Migrate CodeGenHWModes to use const RecordKeeper and const Record
pointers.

This is a part of effort to have better const co

[TableGen] Migrate CodeGenHWModes to use const RecordKeeper (#107851)

Migrate CodeGenHWModes to use const RecordKeeper and const Record
pointers.

This is a part of effort to have better const correctness in TableGen
backends:


https://discourse.llvm.org/t/psa-planned-changes-to-tablegen-getallderiveddefinitions-api-potential-downstream-breakages/81089

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[TableGen] Use bitwise operations to access HwMode ID. (#88377)

1. Bitwise operations are used to access HwMode, allowing for the
coexistence of HwMode IDs for different features (such as RegInfo

[TableGen] Use bitwise operations to access HwMode ID. (#88377)

1. Bitwise operations are used to access HwMode, allowing for the
coexistence of HwMode IDs for different features (such as RegInfo and
EncodingInfo). This will provide better scalability for HwMode.
Currently, most users utilize HwMode primarily for configuring
Register-related information, and few use it for configuring Encoding.
The limited scalability of HwMode has been a significant factor in this
usage pattern.
2. Sink the HwMode Encodings selection logic down to per instruction
level, this makes the logic for choosing encodings clearer and provides
better error messages.
3. Add some HwMode ID conflict detection to the getHwMode() interface.

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[RFC][TableGen] Restructure TableGen Source (#80847)

Refactor of the llvm-tblgen source into:
- a "Basic" library, which contains the bare minimum utilities to build
`llvm-min-tablegen`
- a "Comm

[RFC][TableGen] Restructure TableGen Source (#80847)

Refactor of the llvm-tblgen source into:
- a "Basic" library, which contains the bare minimum utilities to build
`llvm-min-tablegen`
- a "Common" library which contains all of the helpers for TableGen
backends. Such helpers can be shared by more than one backend, and even
unit tested (e.g. CodeExpander is, maybe we can add more over time)

Fixes #80647

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