asm for remquo

this could perhaps use some additional testing for corner cases, but
it seems to be correct.

src/math/i386/remquo.s

+.global remquof
+.type remquof,@function
+remquof:
+	mov 12(%esp),%ecx
+	fldl 4(%esp)
+	fldl 8(%esp)
+	jmp 1f
+
+.global remquol
+.type remquol,@function
+remquol:
+	mov 28(%esp),%ecx
+	fldl 4(%esp)
+	fldl 16(%esp)
+	jmp 1f
+
+.global remquo
+.type remquo,@function
+remquo:
+	mov 20(%esp),%ecx
+	fldl 4(%esp)
+	fldl 12(%esp)
+1:	fld %st(1)
+1:      fprem1
+	fnstsw %ax
+	sahf
+	jp 1b
+	fsubr %st(0),%st(2)
+	fxch %st(2)
+	fdivp
+	mov $0x4f000000,%eax
+	mov %eax,4(%esp)
+	flds 4(%esp)
+	fxch %st(1)
+1:	fprem
+	fnstsw %ax
+	sahf
+	jp 1b
+	fistpl (%ecx)
+	fstp %st(0)
+	ret

src/math/i386/remquof.s

+# see remquo.s

src/math/i386/remquol.s

+# see remquo.s