fix Issue 11822 -  switch causees ICE with  return and other stuff
Set DWARF Version: 3 in .debug_info section
Merge pull request #3087 from ibuclaw/dwarfv3

Set DWARF Version: 3 in .debug_info section
Merge pull request #3081 from WalterBright/fix11822

fix Issue 11822 -  switch causes ICE with  return and other stuff
fix Issue 11896 - isVirtualMethod related GitHub HEAD regression (works with 2.064)
Merge pull request #3088 from 9rnsr/fix11896

[REG2.066a] Issue 11896 - isVirtualMethod related GitHub HEAD regression (works with 2.064)