Re-enable optimizations for various functions on MSVC for VS2019 and above.
A number of functions have the optimizer turned off due to optimizer bugs that were present in VS2015 and VS2017.
Since we can build with VS 2019 (see ), we should enable optimization for these for MSVC.
Unfortunately, it seems that the MSVC compiler (using the latest VS2019) is still having issues with the following function:
void ExtraData::writeExtraData(UChar32 c, Norm &norm)
So we’ll need to keep this one turned off for now.