[debugger] remove mirror cache and v8::Debug::GetMirror.

test/mjsunit/regress/regress-618608.js

Index: test/mjsunit/regress/regress-618608.js
diff --git a/test/mjsunit/regress/regress-618608.js b/test/mjsunit/regress/regress-618608.js
index 02e2cdf3c2f9a58178c369d0857bee811d9f70cd..742cc6e32e65708fbdaf52b49af197f3619b101d 100644
--- a/test/mjsunit/regress/regress-618608.js
+++ b/test/mjsunit/regress/regress-618608.js
@@ -1238,7 +1238,6 @@ gc();
     "use asm";
     var __v_9 = new stdlib.Float32Array(heap);
     var __v_13 = stdlib.Math.fround;
-    assertEquals("number", debug.LookupMirror(__v_112).type());
     function __f_73() {
       var __v_23 = __v_13(1.0);
       var __v_25 = __v_13(2.0);
@@ -1433,38 +1432,3 @@ gc();
   assertEquals(0x87654321, __v_30.__f_50());
 })();
 } catch(e) { print("Caught: " + e); }
-try {
-var __v_112 = debug.MakeMirror(123).handle();
-assertEquals("number", debug.LookupMirror(__v_112).type());
-debug.ToggleMirrorCache(false);
-var __v_114 = debug.MakeMirror(123).handle();
-gc();
-assertEquals(undefined, __v_114);
-assertThrows(function() { debug.LookupMirror(__v_114) });
-debug.ToggleMirrorCache(true);
-var __v_113 = debug.MakeMirror(123).handle();
-assertEquals("number", debug.LookupMirror(__v_113).type());
-} catch(e) { print("Caught: " + e); }
-try {
-var Debug = debug.Debug;
-var __v_25 = null;
-var __v_113 = true;
-} catch(e) { print("Caught: " + e); }
-function __f_112(event, exec_state, event_data, data) {
-  if (event != Debug.DebugEvent.Break) return;
-  try {
-    assertTrue(exec_state.frame(0).sourceLineText().indexOf("BREAK") > 0);
-  } catch (e) {
-    __v_0 = e;
-  }
-}
-function __f_113() {
-  return 1;
-}
-try {
-Debug.setListener(__f_112);
-nop();
-__f_113();
-Debug.setListener(null);
-assertNull(__v_112);
-} catch(e) { print("Caught: " + e); }