[compiler] Add regression tests

Bug: chromium:1209558, chromium:1211215
Tbr: ishell@chromium.org, dinfuehr@chromium.org
Change-Id: I0908927b597432376b8e8881d278b80dca08ed8f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2992723Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75442}

test/mjsunit/compiler/regress-crbug-1209558.js

+// Copyright 2021 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --expose-gc --interrupt-budget=100 --predictable
+
+
+let GC;
+(function () {
+  let countGC = 0;
+  GC = function () {
+    if (countGC++ < 50) gc();
+  };
+})();
+
+
+var dummy = {};
+dummy.index = 1;
+delete dummy.index;
+GC();
+dummy.index = 1;
+delete dummy.index;
+GC();
+dummy.index = 1;
+delete dummy.index;
+GC();
+dummy.index = 1;
+delete dummy.index;
+GC();
+dummy.index = 1;
+delete dummy.index;
+GC();
+
+
+function main() {
+  const obj = {};
+  const anotherobj = { a: 10 };
+  obj.d = anotherobj;
+
+  try {
+    delete obj.d;
+    GC();
+  } catch (e) {}
+
+  try { obj.d = obj; } catch (e) {}
+
+  const a = [1];
+  try {
+    for (var i = 0; i < 10; i++) {
+      var s = "";
+      s.x = function () { if (typeof i == "object") gaga(a); };
+      try { obj[0] = {}; } catch (e) {}
+    }
+  } catch (e) {}
+}
+
+for (var i = 0; i < 50; i++) {
+  main();
+}

test/mjsunit/compiler/regress-crbug-1211215.js

+// Copyright 2021 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --interrupt-budget=1000 --no-lazy-feedback-allocation
+
+var __v_0 = "exception";
+var __v_1 = 0;
+var __v_2 = [, true, true, false, false, true, true, true, false, false, true,
+  true, false, false, true, false, true, true, false, false, true, true,
+  false, true, true, false, false, true, true, false, false, __v_0, __v_1,
+  true, true, __v_0, __v_0, true, true, __v_0, __v_0, false, true, __v_0,
+  __v_0, false, true, __v_0, __v_0, true, false, __v_0, __v_0, true, false,
+  __v_0, __v_0, false, false, __v_0, __v_0, false, false, false, false, __v_0,
+  __v_0, false, false, __v_0, __v_0, true, false, __v_0, __v_0, true, false,
+  __v_0, __v_0, false, true, __v_0, __v_0, false, true, __v_0, __v_0, true,
+  true, __v_0, __v_0, true, true, __v_0, __v_0, __v_0, __v_0, __v_0, __v_0,
+  __v_0, __v_0, __v_0, __v_0, __v_0, __v_0, __v_0, __v_0, __v_0, __v_0, __v_0,
+  __v_0, __v_0, __v_0, __v_0, __v_0, __v_1, __v_0, __v_0, __v_0, __v_0, __v_0,
+  __v_0, __v_1, __v_0, __v_0, __v_0];
+
+for (var __v_3 = 0; __v_3 < 256; __v_3++) {
+  __f_1();
+}
+
+function __f_0() { __v_2[__v_1]; }
+function __f_3() { __v_2.shift(); }
+function __f_1() {
+  try {
+    var __v_18 = __v_8 ? new __v_9() : new __v_17();
+  } catch (e) {}
+  try {
+    var __v_19 = __v_9 ? new __v_16() : new __v_17();
+  } catch (e) {}
+    __f_0();
+    __f_3();
+  try {
+    if (__v_14) {}
+  } catch (e) {}
+}