MFC r323001:

MFC r323001:

In compiler-rt, a few assembler implementations for i386 floating point
conversion functions use SSE2 instructions, but these are not guarded by
#ifdef __SSE2__, and there is no implementation using general purpose
registers.  For these functions, use the generic C variants instead,
otherwise they will cause SIGILL on older processors.

Approved by:	re (kib)
Reported by:	bsdpr@phoe.frmug.org
PR:		221733

MFC r323014:

Follow-up to r323001: if the actually selected CPUTYPE is capable of
SSE2 instructions, we can use them.

Suggested by:	jkim
PR:		221733

git-svn-id: svn://svn.freebsd.org/base/stable/10@323189 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f