Bug 1366650 (part 1) - Move PseudoStack into SpiderMonkey. r=mstange,shu.

This includes renaming its fields to match SpiderMonkey naming conventions
instead of Gecko naming conventions.

This patch is just about moving the code. The next patch will change
SpiderMonkey to actually use PseudoStack directly.

xpcom/threads/ThreadStackHelper.cpp

@@ -13,7 +13,7 @@
 #include "shared-libraries.h"
 #endif
 #ifdef MOZ_THREADSTACKHELPER_PSEUDO
-#include "PseudoStack.h"
+#include "js/ProfilingStack.h"
 #endif
 
 #include "mozilla/Assertions.h"
@@ -492,7 +492,7 @@ ThreadStackHelper::FillStackBuffer()
   intptr_t availableBufferSize = intptr_t(reservedBufferSize);
 
   // Go from front to back
-  const volatile js::ProfileEntry* entry = mPseudoStack->mStack;
+  const volatile js::ProfileEntry* entry = mPseudoStack->entries;
   const volatile js::ProfileEntry* end = entry + mPseudoStack->stackSize();
   // Deduplicate identical, consecutive frames
   const char* prevLabel = nullptr;