Fix some valgrind errors in d8 shell.

This fixes 3 possibly lost warnings occurring when running unit tests under d8:

 28 bytes in 1 blocks are possibly lost in loss record 40 of 68
  at 0x67FB8DB: operator new[](unsigned int)
  by 0x83865CC: v8::Shell::SetOptions(int, char**) (d8.cc:1200)
  by 0x83869A5: v8::Shell::Main(int, char**) (d8.cc:1276)
  by 0x8386B31: main (d8.cc:1333)
Review URL: http://codereview.chromium.org/7780032

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9252 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/d8.cc

@@ -1090,6 +1090,16 @@ void SourceGroup::WaitForThread() {
 #endif  // V8_SHARED
 
 
+ShellOptions::~ShellOptions() {
+  delete[] isolate_sources;
+  isolate_sources = NULL;
+#ifndef V8_SHARED
+  delete parallel_files;
+  parallel_files = NULL;
+#endif // V8_SHARED
+}
+
+
 bool Shell::SetOptions(int argc, char* argv[]) {
   for (int i = 0; i < argc; i++) {
     if (strcmp(argv[i], "--stress-opt") == 0) {
@@ -1198,7 +1208,7 @@ bool Shell::SetOptions(int argc, char* argv[]) {
 
   v8::V8::SetFlagsFromCommandLine(&argc, argv, true);
 
-  // set up isolated source groups
+  // Set up isolated source groups.
   options.isolate_sources = new SourceGroup[options.num_isolates];
   SourceGroup* current = options.isolate_sources;
   current->Begin(argv, 1);

src/d8.h

@@ -191,6 +191,8 @@ class ShellOptions {
      num_isolates(1),
      isolate_sources(NULL) { }
 
+  ~ShellOptions();
+
 #ifndef V8_SHARED
   bool use_preemption;
   int preemption_interval;