[lld] Add a feature for each lld variant when use_lld is called

This allows tests to detect whether to run or not, dependent on which
LLD version is required for the test.

Reviewed by: thopre

Diff

[lld] Add a feature for each lld variant when use_lld is called

This allows tests to detect whether to run or not, dependent on which
LLD version is required for the test.

Reviewed by: thopre

Differential Revision: https://reviews.llvm.org/D101997

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