eliminate one BigInteger

Author: evaniainbrooks

core/src/main/java/org/jruby/RubyTime.java

@@ -113,6 +113,7 @@ public class RubyTime extends RubyObject {
     private static final BigDecimal ONE_MILLION_BD = BigDecimal.valueOf(1000000);
     private static final BigDecimal ONE_BILLION_BD = BigDecimal.valueOf(1000000000);
     public static final int TIME_SCALE = 1_000_000_000;
+    public static final BigInteger TIME_SCALE_BI = BigInteger.valueOf(TIME_SCALE);
     public static final int TIME_SCALE_DIGITS = 9;
 
     private DateTime dt;

core/src/main/java/org/jruby/util/time/TimeArgs.java

@@ -136,7 +136,7 @@ public void initializeTime(ThreadContext context, RubyTime time, DateTimeZone dt
                     }
 
                     long subSeconds = BigInteger.valueOf(numerator)
-                            .multiply(BigInteger.valueOf(TIME_SCALE))
+                            .multiply(RubyTime.TIME_SCALE_BI)
                             .divide(BigInteger.valueOf(denominator))
                             .longValue();