Bug 524256 - Crash stacks not unwound correctly past NS_InvokeByIndex_P on Windows: use a #pragma to inform MSVC that the function has a frame pointer and it should not emit a specialized FPO stack-walking program, r=ted

--HG--
extra : rebase_source : af980dc9c926057869f1b192206da5c06080ceba

xpcom/reflect/xptcall/src/md/win32/xptcinvoke.cpp

@@ -77,6 +77,9 @@ invoke_copy_to_stack(PRUint32* d, PRUint32 paramCount, nsXPTCVariant* s)
 }
 
 #pragma warning(disable : 4035) // OK to have no return value
+// Tell the PDB file this function has a standard frame pointer, and not to use
+// a custom FPO program.
+#pragma optimize( "y", off )
 extern "C" NS_EXPORT __declspec(naked) nsresult NS_FROZENCALL
 NS_InvokeByIndex_P(nsISupports* that, PRUint32 methodIndex,
                  PRUint32 paramCount, nsXPTCVariant* params)