compiler: Use backend interface for set and use temporaries.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@210077 138bc75d-0d04-0410-961f-82ee72b054a4
compiler: Use backend interface for sink expressions.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@210078 138bc75d-0d04-0410-961f-82ee72b054a4