<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/145820>145820</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [HLSL][RootSignature] `HLSLRootSignatureParser` should initialize default `flags` values based on version.
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            HLSL
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
            inbelic
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          inbelic
      </td>
    </tr>
</table>

<pre>
    When adding `RootSignatureVersion` to the compiler options, it was forgotten to also update `setDefaultFlags` [here](https://github.com/llvm/llvm-project/blob/b413bea4355e51e3f3ff248b7d62b4d5d712c743/llvm/include/llvm/Frontend/HLSL/HLSLRootSignature.h#L172), to set the default values of `RootDescriptorFlags` and `DescriptorRangeFlags` dependent on the version.

This requires an update to `RootSignatureParser` to be given the version and initialize accordingly.

AC:
- [ ] Update `RootSignatureParser` to have a `Version` member
- [ ] Use this version member to correctly invoke `setDefaultFlags`
- [ ] Update `setDefaultFlags` to initialize the flags correctly from the updated specs
</pre>
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