Move stack trace extraction code out of TickSample::Init

src/frames.cc

Index: src/frames.cc
diff --git a/src/frames.cc b/src/frames.cc
index 6be27f160e3c916bf5eb6ba6d858e67b3522e87e..ba9ec7913a519d7317c2500a83cc4d31c677318a 100644
--- a/src/frames.cc
+++ b/src/frames.cc
@@ -602,12 +602,13 @@ StackFrame::Type ExitFrame::GetStateForFramePointer(Address fp, State* state) {
   return EXIT;
 }
 
-
 Address ExitFrame::ComputeStackPointer(Address fp) {
+#if defined(USE_SIMULATOR)
+  MSAN_MEMORY_IS_INITIALIZED(fp + ExitFrameConstants::kSPOffset, kPointerSize);
+#endif
   return Memory::Address_at(fp + ExitFrameConstants::kSPOffset);
 }
 
-
 void ExitFrame::FillState(Address fp, Address sp, State* state) {
   state->sp = sp;
   state->fp = fp;