Provide x86 stack alignment rules for MSVC
Provide x86 stack alignment rules for MSVC

MSVC does not have __SSE2__ macro, but _M_IX86_FP==2 like explained at:
- https://msdn.microsoft.com/en-us/library/b0084kay.aspx msdn Microsoft-specific predefined macros
- http://stackoverflow.com/questions/18563978/sse-sse2-is-enabled-control-in-visual-studio

bencoman/pharo-vm,peteruhnak/pharo-vm,peteruhnak/pharo-vm,bencoman/pharo-vm,OpenSmalltalk/vm,OpenSmalltalk/vm,timfel/squeakvm,peteruhnak/pharo-vm,timfel/squeakvm,timfel/squeakvm,peteruhnak/pharo-vm,peteruhnak/pharo-vm,bencoman/pharo-vm,bencoman/pharo-vm,timfel/squeakvm,timfel/squeakvm,bencoman/pharo-vm,bencoman/pharo-vm,timfel/squeakvm,OpenSmalltalk/vm,peteruhnak/pharo-vm,timfel/squeakvm,OpenSmalltalk/vm,OpenSmalltalk/vm,OpenSmalltalk/vm,OpenSmalltalk/vm,OpenSmalltalk/vm,bencoman/pharo-vm,timfel/squeakvm,peteruhnak/pharo-vm,peteruhnak/pharo-vm,bencoman/pharo-vm,bencoman/pharo-vm