Added comment for BLOCK.
Improved comment for FUNCTION.
Added comment for TAG.
Added comment for VARIABLE-TYPE.
Improved comment for VARIABLE-TYPE and FUNCTION-TYPE.
Added comment for VARIABLE-IGNORE.
Added comment for FUNCTION-IGNORE.
Added comment for VARIABLE-DYNAMIC-EXTENT.
Added comment for FUNCTION-DYNAMIC-EXTENT.
Added comment for OPTIMIZE.
Added comment for INLINE.