* Make stack/preemption guard faster on ARM by putting stack...

src/execution.cc

Index: src/execution.cc
===================================================================
--- src/execution.cc	(revision 2758)
+++ src/execution.cc	(working copy)
@@ -234,8 +234,9 @@
            (thread_local_.climit_ == kInterruptLimit &&
             thread_local_.interrupt_flags_ != 0));
 
-    thread_local_.initial_jslimit_ = thread_local_.jslimit_ =
-        GENERATED_CODE_STACK_LIMIT(kLimitSize);
+    uintptr_t limit = GENERATED_CODE_STACK_LIMIT(kLimitSize);
+    thread_local_.initial_jslimit_ = thread_local_.jslimit_ = limit;
+    Heap::SetStackLimit(limit);
     // NOTE: The check for overflow is not safe as there is no guarantee that
     // the running thread has its stack in all memory up to address 0x00000000.
     thread_local_.initial_climit_ = thread_local_.climit_ =
@@ -283,6 +284,7 @@
   // leave them alone.
   if (thread_local_.jslimit_ == thread_local_.initial_jslimit_) {
     thread_local_.jslimit_ = limit;
+    Heap::SetStackLimit(limit);
   }
   if (thread_local_.climit_ == thread_local_.initial_climit_) {
     thread_local_.climit_ = limit;
@@ -397,6 +399,7 @@
 char* StackGuard::RestoreStackGuard(char* from) {
   ExecutionAccess access;
   memcpy(reinterpret_cast<char*>(&thread_local_), from, sizeof(ThreadLocal));
+  Heap::SetStackLimit(thread_local_.jslimit_);
   return from + sizeof(ThreadLocal);
 }