jscript: Use quiet NaNs in jsval.

dlls/jscript/jsval.h

@@ -35,8 +35,8 @@
 #endif
 
 #ifdef JSVAL_DOUBLE_LAYOUT_PTR32
-/* NaN exponent and our 0x80000 marker */
-#define JSV_VAL(x) (0x7ff80000|x)
+/* NaN exponent, quiet bit 0x80000 and our 0x10000 marker */
+#define JSV_VAL(x) (0x7ff90000|x)
 #else
 #define JSV_VAL(x) x
 #endif
@@ -150,10 +150,10 @@ static inline jsval_t jsval_number(double n)
     if((ret.u.s.tag & 0x7ff00000) == 0x7ff00000) {
         /* isinf */
         if(ret.u.s.tag & 0xfffff) {
-            ret.u.s.tag = 0x7ff00000;
+            ret.u.s.tag = 0x7ff80000;
             ret.u.s.u.as_uintptr = ~0;
         }else if(ret.u.s.u.as_uintptr) {
-            ret.u.s.tag = 0x7ff00000;
+            ret.u.s.tag = 0x7ff80000;
         }
     }
 #else
@@ -191,7 +191,7 @@ static inline BOOL is_string(jsval_t v)
 static inline BOOL is_number(jsval_t v)
 {
 #ifdef JSVAL_DOUBLE_LAYOUT_PTR32
-    return (v.u.s.tag & 0x7ff80000) != 0x7ff80000;
+    return (v.u.s.tag & 0x7ff10000) != 0x7ff10000;
 #else
     return v.type == JSV_NUMBER;
 #endif