[ELFAttributeParser][NFC] Make string arrays const (#101460)

Reapply "[RISCV] Support RISCV Atomics ABI attributes (#84597)"

This patch adds support for the atomic_abi attribute, specifid in
https://github.com/riscv-non-isa/riscv-elf-psabi-doc/blob/master/ris

Reapply "[RISCV] Support RISCV Atomics ABI attributes (#84597)"

This patch adds support for the atomic_abi attribute, specifid in
https://github.com/riscv-non-isa/riscv-elf-psabi-doc/blob/master/riscv-elf.adoc#tag_riscv_atomic_abi-14-uleb128version.

This was previously reverted due to ld.bfd segfaulting w/ unknown riscv
attributes. Attribute emission is now guarded by a backend flag
`--riscv-abi-attributes`, which is off by default. Linker support in
LLD for attribute merging is now in a standalone patch.

Reviewers: kito-cheng, MaskRay, asb

Reviewed By: MaskRay

Pull Request: https://github.com/llvm/llvm-project/pull/90266

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Revert "[RISCV] Support RISCV Atomics ABI attributes (#84597)"

This reverts commit 9221f3af8f832d990be986c05d964ad37e5a2356.

As reported
<https://github.com/llvm/llvm-project/pull/84597#issuecommen

Revert "[RISCV] Support RISCV Atomics ABI attributes (#84597)"

This reverts commit 9221f3af8f832d990be986c05d964ad37e5a2356.

As reported
<https://github.com/llvm/llvm-project/pull/84597#issuecomment-2079128332>
and confirmed by me locally, adding these attributes causes current GNU
ld to segfault when processing the input. Reverted so we can discuss
the best next step.

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[RISCV] Support RISCV Atomics ABI attributes (#84597)

This patch adds support for the `atomic_abi` attribute, specifid in

https://github.com/riscv-non-isa/riscv-elf-psabi-doc/blob/master/riscv-el

[RISCV] Support RISCV Atomics ABI attributes (#84597)

This patch adds support for the `atomic_abi` attribute, specifid in

https://github.com/riscv-non-isa/riscv-elf-psabi-doc/blob/master/riscv-elf.adoc#tag_riscv_atomic_abi-14-uleb128version.

The atomics_abi tag merging is conducted as follows:

- UNKNOWN is safe to merge with all other values.
- A6C is compatible with A6S, and results in the A6C ABI.
- A6C is incompatible with A7, and results in an error.
- A6S and A7 are compatible, and merging results in the A7 ABI.

Note: the A7 is not yet supported in either LLVM or in any current
hardware,
and is therefore ommited from attribute generation in
RISCVTargetStreamer.

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Move from llvm::makeArrayRef to ArrayRef deduction guides - llvm/ part

Use deduction guides instead of helper functions.

The only non-automatic changes have been:

1. ArrayRef(some_uint8_pointer, 0

Move from llvm::makeArrayRef to ArrayRef deduction guides - llvm/ part

Use deduction guides instead of helper functions.

The only non-automatic changes have been:

1. ArrayRef(some_uint8_pointer, 0) needs to be changed into ArrayRef(some_uint8_pointer, (size_t)0) to avoid an ambiguous call with ArrayRef((uint8_t*), (uint8_t*))
2. CVSymbol sym(makeArrayRef(symStorage)); needed to be rewritten as CVSymbol sym{ArrayRef(symStorage)}; otherwise the compiler is confused and thinks we have a (bad) function prototype. There was a few similar situation across the codebase.
3. ADL doesn't seem to work the same for deduction-guides and functions, so at some point the llvm namespace must be explicitly stated.
4. The "reference mode" of makeArrayRef(ArrayRef<T> &) that acts as no-op is not supported (a constructor cannot achieve that).

Per reviewers' comment, some useless makeArrayRef have been removed in the process.

This is a follow-up to https://reviews.llvm.org/D140896 that introduced
the deduction guides.

Differential Revision: https://reviews.llvm.org/D140955

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Use range-based for loops (NFC)

Revert "Rename llvm::array_lengthof into llvm::size to match std::size from C++17"

This reverts commit ef8206320769ad31422a803a0d6de6077fd231d2.

- It conflicts with the existing llvm::size in STLEx

Revert "Rename llvm::array_lengthof into llvm::size to match std::size from C++17"

This reverts commit ef8206320769ad31422a803a0d6de6077fd231d2.

- It conflicts with the existing llvm::size in STLExtras, which will now
never be called.
- Calling it without llvm:: breaks C++17 compat

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Rename llvm::array_lengthof into llvm::size to match std::size from C++17

As a conquence move llvm::array_lengthof from STLExtras.h to
STLForwardCompat.h (which is included by STLExtras.h so no buil

Rename llvm::array_lengthof into llvm::size to match std::size from C++17

As a conquence move llvm::array_lengthof from STLExtras.h to
STLForwardCompat.h (which is included by STLExtras.h so no build
breakage expected).

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[RISCV] ELF attribute section for RISC-V.

Leverage ARM ELF build attribute section to create ELF attribute section
for RISC-V. Extract the common part of parsing logic for this section
into ELFAttri

[RISCV] ELF attribute section for RISC-V.

Leverage ARM ELF build attribute section to create ELF attribute section
for RISC-V. Extract the common part of parsing logic for this section
into ELFAttributeParser.[cpp|h] and ELFAttributes.[cpp|h].

Differential Revision: https://reviews.llvm.org/D74023

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