Implements static samplers parsing from root signature metadata
representation. This is required to support Root Signatures in HLSL.
Closes: #[126641](https://github.com/llvm/llvm-project/issues/126641)

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Co-authored-by: joaosaffran <joao.saffran@microsoft.com>

In #144957 the backend was updated to expect a version in the metadata,
but since the frontend wasn't updated this breaks compilation. This is a
somewhat temporary fix to that until #144813 lands.

Implements descriptor table parsing from root signature metadata. This
is required to support root signatures in hlsl.
Closes: #[126640](https://github.com/llvm/llvm-project/issues/126640)

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Co-authored-by: joaosaffran <joao.saffran@microsoft.com>

Updates the Root Signature metadata parser to extract version
information. This requirement was added after the initial parser
implementation.

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Co-authored-by: joaosaffran <joao.saffran@microsoft.com>

- adds parsing from metadata into dxcontainer binary
- adds validations as described in the spec
- adds testing scenarios
closes: [#126638](https://github.com/llvm/llvm-project/issues/126638)

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Co-authored-by: joaosaffran <joao.saffran@microsoft.com>

Adds resource name argument to `llvm.dx.handlefrombinding` and `llvm.dx.handlefromimplicitbinding` intrinsics.
SPIR-V currently does not seem to need the resource names so this change only affects DirectX binding intrinsics.

Part 2/4 of https://github.com/llvm/llvm-project/issues/105059

- Closes [#126637](https://github.com/llvm/llvm-project/issues/126637)

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Co-authored-by: joaosaffran <joao.saffran@microsoft.com>

Adding support for Root Constant in MC, Object and obj2yaml and
yaml2obj, this PR adds:
  - new structures to dxbc definition.
  - serialize and desirialize logic from dxcontainer to yaml
  - tests validating against dxc
  - adding support to multiple parts.

Closes: https://github.com/llvm/llvm-project/issues/126633

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Co-authored-by: joaosaffran <joao.saffran@microsoft.com>

DXC and the DXIL validator expect resources in a DX container to be
specifically ordered CBuffers, Samplers, SRVs, and then UAVs. Match this
behaviour so that we can pass the validator.

Fixes #130232.

This PR adds a few more tests to validate some error scenarios of root
signature metadata representation.

Closes: https://github.com/llvm/llvm-project/issues/127280

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Co-authored-by: joaosaffran <joao.saffran@microsoft.com>