[clang] [clang][driver] Fix -print-libgcc-file-name on Darwin platforms (PR #98325)

[Louis Dionne via cfe-commits]

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+// Test the output of -print-libgcc-file-name on Darwin.
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ldionne wrote:

Ack. I think it's reasonable not to try to fix everything in one go since it seems really involved. However, my thinking is more that the Darwin driver is the odd one out here, the driver should be initialized when we construct it, not "lazily" when we compute the arguments. I think it's the only driver which does that, and isn't *that* the source of all our problems?

https://github.com/llvm/llvm-project/pull/98325