[Bug 207599] fixes for kernel built with clang failing to boot on ppc64 qemu

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207599

--- Comment #2 from Kenneth Salerno <kennethsalerno at yahoo.com> ---
(In reply to Mark Millard from comment #1)
Thanks, Mark. I looked through the LLVM ticket and didn't find anything
relevant to this issue on powerpc64 clang.

Seems to be hanging at branch to counter register (when I compared to the asm
generated by GCC, that code had instead a branch to link register).

I even tried building the kernel modules with GCC where -mlongcall was needed
and clang for everything else, though soft-float is a missing option in clang
that I'm not sure is necessary or not. I noticed building with altivec support
kills the kernel load even sooner so maybe soft-float is a necessary switch
clang needs for powerpc64 to build a working kernel?

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