fix Issue 9844 - DMD (-m64) int long initialisation bug
propagate size_t errors
Fixes Issue 9184 - Document -op better.
Merge pull request #1860 from AndrejMitrovic/Fix9185_2

[trivial] Issue 9184 - Document -op better.
Merge pull request #1856 from WalterBright/size_t_error

propagate size_t errors
Merge pull request #1846 from WalterBright/fix9844

fix Issue 9844 - DMD (-m64) int long initialisation bug
fix Issue 8130 - Memory corruption because without *.def file DMD compiles DLL with assumption
Merge pull request #1864 from WalterBright/fix8130

fix Issue 8130 - Memory corruption because without *.def file DMD compil...