enable boxing elimination

Author: DSouzaM

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/nodes/bytecode_dsl/PBytecodeDSLRootNode.java

@@ -217,6 +217,7 @@
                 languageClass = PythonLanguage.class, //
                 enableYield = true, //
                 enableSerialization = true, //
+                boxingEliminationTypes = {int.class, boolean.class}, //
                 storeBciInFrame = true //
 )
 @TypeSystemReference(PythonTypes.class)

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/nodes/frame/MaterializeFrameNode.java

@@ -49,7 +49,6 @@
 import com.oracle.graal.python.runtime.PythonOptions;
 import com.oracle.graal.python.runtime.object.PythonObjectFactory;
 import com.oracle.graal.python.util.PythonUtils;
-import com.oracle.truffle.api.CompilerAsserts;
 import com.oracle.truffle.api.Truffle;
 import com.oracle.truffle.api.bytecode.BytecodeNode;
 import com.oracle.truffle.api.dsl.Bind;