[Tests] Fix some OOM failures on Android by explicitly setting max_old_space_size.

BUG=v8:8040

Change-Id: I8de22af3978f2a8eb844eabdb757bd635050f901
Reviewed-on: https://chromium-review.googlesource.com/1181432Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55227}

test/mjsunit/mjsunit.status

@@ -648,9 +648,6 @@
   'regress/regress-6288': [FAIL],
   # OOM:
   'regress/regress-599414-array-concat-fast-path': [FAIL],
-  'regress/regress-748069': [FAIL],
-  'regress/regress-752764': [FAIL],
-  'regress/regress-779407': [FAIL],
 }],  # 'system == android'
 
 ##############################################################################

test/mjsunit/regress/regress-748069.js

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// Flags: --max-old-space-size=1536
+
 try {
   var a = 'a'.repeat(1 << 28);
 } catch (e) {

test/mjsunit/regress/regress-752764.js

@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 // Flags: --allow-natives-syntax --nostress-incremental-marking
+// Flags: --max-old-space-size=1536
 
 // This test uses a lot of memory and fails with flaky OOM when run
 // with --stress-incremental-marking on TSAN.

test/mjsunit/regress/regress-779407.js

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// Flags: --max-old-space-size=1536
+
 var s = '\u1234-------';
 for (var i = 0; i < 17; i++) {
   try {