fix typo in the x86_64 rounding asm

src/math/x86_64/llrint.s

 .global llrint
 .type llrint,@function
 llrint:
-	cvtsd2si @xmm0,%rax
+	cvtsd2si %xmm0,%rax
 	ret

src/math/x86_64/llrintf.s

 .global llrintf
 .type llrintf,@function
 llrintf:
-	cvtss2si @xmm0,%rax
+	cvtss2si %xmm0,%rax
 	ret

src/math/x86_64/lrint.s

 .global lrint
 .type lrint,@function
 lrint:
-	cvtsd2si @xmm0,%rax
+	cvtsd2si %xmm0,%rax
 	ret

src/math/x86_64/lrintf.s

 .global lrintf
 .type lrintf,@function
 lrintf:
-	cvtss2si @xmm0,%rax
+	cvtss2si %xmm0,%rax
 	ret