Constant Fold Logf128 calls (#84501)

This patch enables constant folding for 128 bit floating-point logf
calls. This is achieved by querying if the host system has the logf128()
symbol available with a CMake test. If so, replace the runtime call with
the compile time value returned from logf128.

GitOrigin-RevId: e90bc9cfd4d22c89dd993f62ede700ae25df49c5
14 files changed