Make method_call benchmark use inheritance.

This also fixes a bug where constructors weren't being bound
correctly, and eliminates some unneeded instructions when
compiling ifs.

I also tweaked the other method_call languages to match Wren's.
Since Wren needs to do a super call to get to the parent _count,
the other languages do now too.

This is nice too because it means we're benchmarking super 
calls.

src/wren_compiler.c

@@ -1805,20 +1805,25 @@ void statement(Compiler* compiler)
     // Compile the then branch.
     block(compiler);
 
-    // Jump over the else branch when the if branch is taken.
-    emit(compiler, CODE_JUMP);
-    int elseJump = emit(compiler, 255);
-
-    patchJump(compiler, ifJump);
-
     // Compile the else branch if there is one.
     if (match(compiler, TOKEN_ELSE))
     {
+      // Jump over the else branch when the if branch is taken.
+      emit(compiler, CODE_JUMP);
+      int elseJump = emit(compiler, 255);
+
+      patchJump(compiler, ifJump);
+      
       block(compiler);
+
+      // Patch the jump over the else.
+      patchJump(compiler, elseJump);
+    }
+    else
+    {
+      patchJump(compiler, ifJump);
     }
 
-    // Patch the jump over the else.
-    patchJump(compiler, elseJump);
     return;
   }