Remove result coalescing

Trying to coalesce SSA nodes with a result phi node is causing
BDD resolution issues. Removing for now.

Author: mtdowling

smithy-rules-engine/src/main/java/software/amazon/smithy/rulesengine/language/evaluation/RuleEvaluator.java

@@ -137,21 +137,6 @@ public Value evaluateRuleSet(EndpointRuleSet ruleset, Map<Identifier, Value> par
         });
     }
 
-    /**
-     * Configure the rule evaluator with the given parameters and parameter values for manual evaluation.
-     *
-     * @param parameters Parameters of the ruleset to evaluate.
-     * @param parameterArguments Parameter values to evaluate the ruleset against.
-     * @return the updated evaluator.
-     */
-    public RuleEvaluator withParameters(Parameters parameters, Map<Identifier, Value> parameterArguments) {
-        for (Parameter parameter : parameters) {
-            parameter.getDefault().ifPresent(value -> scope.insert(parameter.getName(), value));
-        }
-        parameterArguments.forEach(scope::insert);
-        return this;
-    }
-
     /**
      * Evaluates the given condition in the current scope.
      *
@@ -185,14 +170,13 @@ public Value visitIsSet(Expression fn) {
 
     @Override
     public Value visitCoalesce(List<Expression> expressions) {
-        Value result = Value.emptyValue();
         for (Expression exp : expressions) {
-            result = exp.accept(this);
+            Value result = exp.accept(this);
             if (!result.isEmpty()) {
                 return result;
             }
         }
-        return result;
+        return Value.emptyValue();
     }
 
     @Override