Fix ast-id-only IR debug info output

[LeviofCrypto]

Description

settings.debug.debugInfo: ["ast-id"] still emitted @src comments in generated IR because the shared source-location helper treated any non-empty debug info selection as a location request. Skip location comment creation unless the location component is selected, while preserving @ast-id output.

Adds a Standard JSON cmdline test for the ast-id-only IR/EVM assembly output case.

Checklist

• I have read the contributing guidelines and the review checklist
• I have personally reviewed, understood, and tested every change in this PR

AI Disclosure

• No AI tools were used
• AI tools were used (details below)

OpenAI Codex assisted with reviewing the change.

[matheusaaguiar]

Hi @LeviofCrypto , thanks for the PR.
It looks good, but there is still one spot missing.
AsmPrinter::formatDebugData, calls formatSourceLocation and still leaks @src under ast-id only.
So a Yul input with @src given to the compiler will not remove those under ast-id only setting.

/// @use-src 0:"input.sol"
object "C_6_deployed" {
    code {
        /// @src 0:60:101  "contract C {..."
        mstore(64, 128)
    }
}

$ solc --strict-assembly --debug-info ast-id input.yul

[matheusaaguiar]

f() is optimized out in the irOptimized output. It would be interesting to have a more complex function that can show in the optmized output.

[matheusaaguiar]

This PR also needs a Changelog entry.