Revert of [debugger] debug-evaluate should not not modify local values.

test/mjsunit/debug-evaluate-shadowed-context.js

Index: test/mjsunit/debug-evaluate-shadowed-context.js
diff --git a/test/mjsunit/debug-evaluate-shadowed-context.js b/test/mjsunit/debug-evaluate-shadowed-context.js
index 6847a93f66216d1306007022211d4758a8b5da66..221efb39d071e07832908c0c67164b66b6860a6d 100644
--- a/test/mjsunit/debug-evaluate-shadowed-context.js
+++ b/test/mjsunit/debug-evaluate-shadowed-context.js
@@ -29,8 +29,7 @@
     }
     assertEquals("[object global]",
                  String(exec_state.frame(0).evaluate("this").value()));
-    assertEquals("y", exec_state.frame(0).evaluate("y").value());
-    assertEquals("a", exec_state.frame(0).evaluate("a").value());
+    exec_state.frame(0).evaluate("y = 'Y'");
     exec_state.frame(0).evaluate("a = 'A'");
     assertThrows(() => exec_state.frame(0).evaluate("z"), ReferenceError);
   } catch (e) {
@@ -42,7 +41,7 @@
 Debug.setListener(listener);
 
 var a = "a";
-(function() {
+assertEquals("Y", (function() {
   var x = 1;     // context allocate x
   (() => x);
   var y = "y";
@@ -55,12 +54,12 @@
     })();        // 2
   })();          // 1
   return y;
-})();
+})());
 
 assertEquals("A", a);
 a = "a";
 
-(function() {
+assertEquals("Y", (function() {
   var x = 1;     // context allocate x
   (() => x);
   var y = "y";
@@ -75,7 +74,7 @@
     })();        // 2
   })();          // 1
   return y;
-})();
+})());
 
 assertEquals("A", a);