Added flags for new Linaro GCC 4.8

## The behavior of -Wall has changed and now includes the new warning flag
## -Wsizeof-pointer-memaccess. This may result in new warnings in code that 
## compiled cleanly with previous versions of GCC.
## As a workaround, use -Wno-sizeof-pointer-memaccess.
##
## More aggressive loop optimizations
## Improvements to the GCC infrastructure allow improvements in the ability of the 
## optimizers to transform loops. Some loops that previously invoked undefined 
## behavior may now be turned into endless loops.
##