asm for log functions

src/math/i386/log.s

+.global log
+.type log,@function
+log:
+	fldln2
+	fldl 4(%esp)
+	fyl2x
+	ret

src/math/i386/log10.s

+.global log10
+.type log10,@function
+log10:
+	fldlg2
+	fldl 4(%esp)
+	fyl2x
+	ret

src/math/i386/log10f.s

+.global log10f
+.type log10f,@function
+log10f:
+	fldlg2
+	flds 4(%esp)
+	fyl2x
+	ret

src/math/i386/log10l.s

+.global log10l
+.type log10l,@function
+log10l:
+	fldlg2
+	fldt 4(%esp)
+	fyl2x
+	ret

src/math/i386/logf.s

+.global logf
+.type logf,@function
+logf:
+	fldln2
+	flds 4(%esp)
+	fyl2x
+	ret

src/math/i386/logl.s

+.global logl
+.type logl,@function
+logl:
+	fldln2
+	fldt 4(%esp)
+	fyl2x
+	ret