Add compiler/linker flags to optimize WinRT release builds
Add compiler/linker flags to optimize WinRT release builds

BUG=angleproject:1250

Change-Id: I2ce0e9597c49515fe4b414f105b03785d6ce132f

mlfarrell/angle,MSOpenTech/angle,mlfarrell/angle,MSOpenTech/angle,mlfarrell/angle,MSOpenTech/angle,mlfarrell/angle,MSOpenTech/angle