Increase ARM/MIPS simulators stack safety margin to 512 bytes

src/mips/simulator-mips.cc

Index: src/mips/simulator-mips.cc
diff --git a/src/mips/simulator-mips.cc b/src/mips/simulator-mips.cc
index 17c18977c702fb42dd330b87571e2b4d80e8685d..0ec3e283c6617139a39387d80d8a1e83260e5a01 100644
--- a/src/mips/simulator-mips.cc
+++ b/src/mips/simulator-mips.cc
@@ -1359,9 +1359,9 @@ void Simulator::WriteB(int32_t addr, int8_t value) {
 
 // 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;
 }