* cranelift: Upgrade libm to 0.2.4
This resolves an issue with incorrect fmaf on the x86_64-pc-windows-gnu target under some inputs.
See: #4517
* supply-chain: Vet `libm` 0.2.4
* cranelift: Add MinGW `fma` regression tests
* cranelift: Fix FMA in interpreter
* cranelift: Add separate `fma` test suite for the interpreter
The interpreter can run `fma.clif` on most platforms, however on
`x86_64-pc-windows-gnu` we use libm which has issues with some inputs.
We should delete `fma-interpreter.clif` and enable the interpreter on
the main `fma.clif` file once those are fixed.
* cranelift: Implement `fma` on interpreter
* cranelift: Implement `fabs` on interpreter
* cranelift: Fix `fneg` implementation on interpreter
`fneg` was implemented as `0 - x` which is not correct according to the
standard since that operation makes no guarantees on what the output
is when the input is `NaN`. However for `fneg` the output for `NaN`
inputs is fully defined.
* cranelift: Implement `fcopysign` on interpreter
