* Resolve libcall relocations for older CPUs
Long ago Wasmtime used to have logic for resolving relocations
post-compilation for libcalls which I ended up removing during
refactorings last year. As #5563 points out, however, it's possible to
get Wasmtime to panic by disabling SSE features which forces Cranelift
to use libcalls for some floating-point operations instead. Note that
this also requires disabling SIMD because SIMD support has a baseline of
SSE 4.2.
This commit pulls back the old implementations of various libcalls and
reimplements logic necessary to have them work on CPUs without SSE 4.2
Closes#5563
* Fix log message in `wast` support
* Fix offset listed in relocations
Be sure to factor in the offset of the function itself
* Review comments
9b896d2a70