Add guard pages in front of platform allocations

src/platform-cygwin.cc

Index: src/platform-cygwin.cc
===================================================================
--- src/platform-cygwin.cc	(revision 8657)
+++ src/platform-cygwin.cc	(working copy)
@@ -166,6 +166,11 @@
 }
 
 
+void OS::Guard(void* address, const size_t size) {
+  mprotect(address, size, PROT_NONE);

[Mads Ager (chromium), 2011/07/17 09:47:53]

Instead of having identical code in all of these platform files, please just add
this to platform-posix.cc. That will take care of freebsd, openbsd, linux,
macos, solaris and cygwin.

[Cris Neckar, 2011/07/18 23:55:12]

Done.

+}
+
+
 void OS::Sleep(int milliseconds) {
   unsigned int ms = static_cast<unsigned int>(milliseconds);
   usleep(1000 * ms);