LibJS: Implement <= and >= binary operators

Author: https://github.com/deoxxa
Commit: 0fe87c5fec
Pull-request: https://github.com/SerenityOS/serenity/pull/1425
Reviewed-by: https://github.com/sunverwerth

Libraries/LibJS/Value.cpp

@@ -96,6 +96,13 @@ Value greater_than(Value lhs, Value rhs)
     return Value(lhs.as_double() > rhs.as_double());
 }
 
+Value greater_than_equals(Value lhs, Value rhs)
+{
+    ASSERT(lhs.is_number());
+    ASSERT(rhs.is_number());
+    return Value(lhs.as_double() >= rhs.as_double());
+}
+
 Value less_than(Value lhs, Value rhs)
 {
     ASSERT(lhs.is_number());
@@ -103,6 +110,13 @@ Value less_than(Value lhs, Value rhs)
     return Value(lhs.as_double() < rhs.as_double());
 }
 
+Value less_than_equals(Value lhs, Value rhs)
+{
+    ASSERT(lhs.is_number());
+    ASSERT(rhs.is_number());
+    return Value(lhs.as_double() <= rhs.as_double());
+}
+
 Value bitwise_and(Value lhs, Value rhs)
 {
     ASSERT(lhs.is_number());