LoadableByAddress was accidentally changing ownership of
direct_unowned values to @in (owned). This generates unsupported SIL
for on-stack partial applies, which now breaks SIL verification.
This also resulted in extra copies of values inside of closure
contexts. Before calling the original function, the value would need to
be copied onto the stack and the context would be destroyed. Now, we
simply pass a pointer directly from the closure context. See
IRGen/indirect_argument.sil+huge_partial_application.
I'm pretty sure fixing this has no effect on the mangling of public symbols.
The SIL type lowering logic for AutoDiff gets the substituted generic signature
mixed up with the invocation generic signature, so it tries to ask questions
about DependentMemberTypes in a signature with no requirements. This triggers
assertions when the requirement machine is enabled.
Disable the requirement machine until this is fixed.
`-lm` is not portable, it is only needed on certain platforms (e.g.
Linux, not BSD). Remove the explicit link.
Avoid using a static library as that is not supported on all platforms
(e.g. Windows). Use the helper macros to generate the library.
Repairs the Windows tests.
