Update ldexp.c for amd64.

lib/libc/amd64/gen/Makefile.inc

@@ -3,4 +3,4 @@
 
 SRCS+=	_setjmp.S setjmp.S sigsetjmp.S \
 	fabs.S modf.S \
-	frexp.c infinity.c isinf.c
+	frexp.c infinity.c isinf.c ldexp.c

lib/libc/amd64/gen/ldexp.c

@@ -58,15 +58,9 @@ ldexp (double value, int exp)
 	double temp, texp, temp2;
 	texp = exp;
 #ifdef __GNUC__
-#if    __GNUC__ >= 2
 	asm ("fscale "
 		: "=u" (temp2), "=t" (temp)
 		: "0" (texp), "1" (value));
-#else
-	asm ("fscale ; fxch %%st(1) ; fstp%L1 %1 "
-		: "=f" (temp), "=0" (temp2)
-		: "0" (texp), "f" (value));
-#endif
 #else
 error unknown asm
 #endif