[GlobalISel] Fix inverted libcall status check in createFCMPLibcall (#219242) BuildLibcall tested `if (!Status)` on the LegalizeResult returned by createLibcall. Since LegalizeResult is an enum with AlreadyLegal == 0, that condition is false for both Legalized and UnableToLegalize, so a failed libcall was never detected. The helper then built an ICMP against the undefined result register and reported success, so the legalizer never fell back. Check `Status != Legalized` instead, so failures propagate and the caller can bail out. On arm64ec, GlobalISel call lowering is unimplemented, so this silently dropped `fp128` compare libcalls at `-O0`. Add a test that checks the expected `__eqtf2`, `__lttf2` and `__unordtf2` calls are emitted at both `-O0` and `-O2`.
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