[RISCV] Match widening fp instructions with same fpext used in multiple operands (#125803)

Because the fpext has a single use constraint on it we can't match cases
where it's used for both operands.

Introduce a new PatFrag that allows multiple uses on a single user and
use it for the binary patterns, and some ternary patterns.

(For some of the ternary patterns there is a fneg that counts as a
separate user, we still need to handle these)

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