Attach annotations to the closest prefix expression instead of
whole statement if no new line found after annotations
The motivation is for a simple annotated expression like '@ann x + y'
its syntax form must not change after prepending 'val z = ' just before it
This change only matters in cases of if/when/for/while having braceless
blocks
Annotations on them are parsed now as on block-level expressions, i.e.
they're attached to the whole expression
If a block statement starts with annotations treat them as they
belong to node of the statement rather than to the closest prefix expression
#KT-10210 Fixed
Denis Zharkov