Increase ARM/MIPS simulators stack safety margin to 512 bytes

src/arm/simulator-arm.cc

Index: src/arm/simulator-arm.cc
diff --git a/src/arm/simulator-arm.cc b/src/arm/simulator-arm.cc
index 5704202622323fb9bc0776cf5d4c563b3bf73ff9..542cc302d30f09c8db016b977930181ae76304a8 100644
--- a/src/arm/simulator-arm.cc
+++ b/src/arm/simulator-arm.cc
@@ -1268,9 +1268,9 @@ void Simulator::WriteDW(int32_t addr, int32_t value1, int32_t value2) {
 
 // Returns the limit of the stack area to enable checking for stack overflows.
 uintptr_t Simulator::StackLimit() const {
-  // Leave a safety margin of 256 bytes to prevent overrunning the stack when
+  // Leave a safety margin of 512 bytes to prevent overrunning the stack when
   // pushing values.
-  return reinterpret_cast<uintptr_t>(stack_) + 256;
+  return reinterpret_cast<uintptr_t>(stack_) + 512;
 }