Bug 1196370 - Remove the clang assembly workaround from bug 1028613. r=ehsan

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

@@ -69,14 +69,6 @@ noparams:
         mov     eax,methodIndex
         call    dword ptr[edx+eax*4] // stdcall, i.e. callee cleans up stack.
         mov     esp,ebp
-#ifdef __clang__
-        // clang-cl doesn't emit the pop and ret instructions because it doesn't realize
-        // that the call instruction sets a return value in eax.  See
-        // https://bugzilla.mozilla.org/show_bug.cgi?id=1028613 and
-        // http://llvm.org/bugs/show_bug.cgi?id=17201.
-        pop     ebp
-        ret
-#endif
     }
 }
 #pragma warning(default : 4035) // restore default