Fix #22504 - druntime fails to build on powerpc64le-linux-gnu

[ibuclaw]

It's now required to enclose the ConditionalExpression of an AsmStringExpr around parentheses.

Closes #22504

[dlang-bot]

Thanks for your pull request, @ibuclaw!

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Testing this PR locally

If you don't have a local development environment setup, you can use Digger to test this PR:

dub run digger -- build "master + dmd#22505"