Revert 10413-10416 initial memory use reduction due to

src/platform-openbsd.cc

Index: src/platform-openbsd.cc
===================================================================
--- src/platform-openbsd.cc	(revision 10413)
+++ src/platform-openbsd.cc	(working copy)
@@ -512,11 +512,18 @@
 
 Thread::Thread(const Options& options)
     : data_(new PlatformData()),
-      stack_size_(options.stack_size()) {
-  set_name(options.name());
+      stack_size_(options.stack_size) {
+  set_name(options.name);
 }
 
 
+Thread::Thread(const char* name)
+    : data_(new PlatformData()),
+      stack_size_(0) {
+  set_name(name);
+}
+
+
 Thread::~Thread() {
   delete data_;
 }
@@ -782,10 +789,8 @@
     FULL_INTERVAL
   };
 
-  static const int kSignalSenderStackSize = 32 * KB;
-
   explicit SignalSender(int interval)
-      : Thread(Thread::Options("SignalSender", kSignalSenderStackSize)),
+      : Thread("SignalSender"),
         vm_tgid_(getpid()),
         interval_(interval) {}