Add test for exception handler context switch.

This adds test cases for exception handlers that require a context
switch when entering the catch-block or the finally-block, triggered
through nested contexts within the try-block.

R=jarin@chromium.org

Review URL: https://codereview.chromium.org/1681933002

Cr-Commit-Position: refs/heads/master@{#33845}

test/mjsunit/compiler/try-context.js

@@ -0,0 +1,89 @@
+// Copyright 2016 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: --allow-natives-syntax
+
+(function TryBlockCatch() {
+  var global = 0;
+  function f(a) {
+    var x = a + 23
+    try {
+      let y = a + 42;
+      function capture() { return x + y }
+      throw "boom!";
+    } catch(e) {
+      global = x;
+    }
+    return x;
+  }
+  assertEquals(23, f(0));
+  assertEquals(24, f(1));
+  %OptimizeFunctionOnNextCall(f);
+  assertEquals(25, f(2));
+  assertEquals(25, global);
+})();
+
+(function TryBlockFinally() {
+  var global = 0;
+  function f(a) {
+    var x = a + 23
+    try {
+      let y = a + 42;
+      function capture() { return x + y }
+      throw "boom!";
+    } finally {
+      global = x;
+    }
+    return x;
+  }
+  assertThrows(function() { f(0) });
+  assertThrows(function() { f(1) });
+  %OptimizeFunctionOnNextCall(f);
+  assertThrows(function() { f(2) });
+  assertEquals(25, global);
+})();
+
+(function TryCatchCatch() {
+  var global = 0;
+  function f(a) {
+    var x = a + 23
+    try {
+      try {
+        throw "boom!";
+      } catch(e2) {
+        function capture() { return x + y }
+        throw "boom!";
+      }
+    } catch(e) {
+      global = x;
+    }
+    return x;
+  }
+  assertEquals(23, f(0));
+  assertEquals(24, f(1));
+  %OptimizeFunctionOnNextCall(f);
+  assertEquals(25, f(2));
+  assertEquals(25, global);
+})();
+
+(function TryWithCatch() {
+  var global = 0;
+  function f(a) {
+    var x = a + 23
+    try {
+      with ({ y : a + 42 }) {
+        function capture() { return x + y }
+        throw "boom!";
+      }
+    } catch(e) {
+      global = x;
+    }
+    return x;
+  }
+  assertEquals(23, f(0));
+  assertEquals(24, f(1));
+  %OptimizeFunctionOnNextCall(f);
+  assertEquals(25, f(2));
+  assertEquals(25, global);
+})();