Enhance SafeStackFrameIterator to avoid triggering assertions in debug mode.

src/arm/frames-arm.cc

Index: src/arm/frames-arm.cc
diff --git a/src/arm/frames-arm.cc b/src/arm/frames-arm.cc
index 47434392dfe9b1f82b3a7852e0b0ae8d47413a37..b0c09903060cb49fa480b586982e761623158e74 100644
--- a/src/arm/frames-arm.cc
+++ b/src/arm/frames-arm.cc
@@ -37,17 +37,8 @@ namespace v8 {
 namespace internal {
 
 
-StackFrame::Type ExitFrame::GetStateForFramePointer(Address fp, State* state) {
-  if (fp == 0) return NONE;
-  // Compute frame type and stack pointer.
-  Address sp = fp + ExitFrameConstants::kSPOffset;
-
-  // Fill in the state.
-  state->sp = sp;
-  state->fp = fp;
-  state->pc_address = reinterpret_cast<Address*>(sp - 1 * kPointerSize);
-  ASSERT(*state->pc_address != NULL);
-  return EXIT;
+Address ExitFrame::ComputeStackPointer(Address fp) {
+  return fp + ExitFrameConstants::kSPOffset;
 }