optimize deserialize float/double

Author: wenshao

benchmark/src/test/java/com/alibaba/fastjson2/benchmark/jjb/UsersParseUTF8BytesTest.java

@@ -77,10 +77,10 @@ public static void jackson() throws Exception {
     }
 
     public static void main(String[] args) throws Exception {
-//        fastjson2();
+        fastjson2();
 //        fastjson2_str();
 //        fastjson2_chars();
-        wast();
+//        wast();
 //        dsljson();
 //        jackson();
     }

core/src/main/java/com/alibaba/fastjson2/JSONReaderUTF16.java

@@ -2631,7 +2631,7 @@ public double readDoubleValue() {
                     value = false;
                 }
                 if (!value) {
-                    if (scale > 0 && scale < 128) {
+                    if (scale > 0 && scale < 64) {
                         doubleValue = TypeUtils.doubleValue(fc == '-' ? -1 : 1, Math.abs(result), scale);
                     } else {
                         result = 1; // invalid

core/src/main/java/com/alibaba/fastjson2/JSONReaderUTF8.java

@@ -3692,7 +3692,7 @@ public final double readDoubleValue() {
                     value = false;
                 }
                 if (!value) {
-                    if (scale > 0 && scale < 128) {
+                    if (scale > 0 && scale < 64) {
                         doubleValue = TypeUtils.doubleValue(fc == '-' ? -1 : 1, Math.abs(result), scale);
                     } else {
                         result = 1; // invalid