avoid varargs allocation for checkIn(), the hot path

Author: fluentfuture

mug-concurrent-testing/src/main/java/com/google/mu/testing/concurrent/Happenstance.java

@@ -279,13 +279,6 @@ private static void checkArgument(boolean condition, String message, Object... a
     }
   }
 
-  @FormatMethod
-  private static void checkState(boolean condition, String message, Object... args) {
-    if (!condition) {
-      throw new IllegalStateException(String.format(message, args));
-    }
-  }
-
   @FormatMethod
   private static void checkState(boolean condition, String message, Object arg) {
     if (!condition) {