ARM64: Fix alignment of stack-passed apply arguments
ARM64: Fix alignment of stack-passed apply arguments

Note that we can probably move this code out of LowerMD later, since
the differences between different platforms seem to all be due to
hardcoding this value differently.

Microsoft/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore,mrkmarron/ChakraCore,mrkmarron/ChakraCore,mrkmarron/ChakraCore,mrkmarron/ChakraCore,Microsoft/ChakraCore,mrkmarron/ChakraCore,mrkmarron/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore,mrkmarron/ChakraCore