re PR debug/47106 (-fcompare-debug failure (length) with  -fpartial-inlining -flto -fconserve-stack)

PR debug/47106
PR debug/47402
* tree-flow.h (FOR_EACH_REFERENCED_VAR): Add FN argument.
Adjust all users.  Pass FN to...
* tree-flow-inline.h (first_referenced_var): ... this.  Add
fn argument.
* ipa-struct-reorg.c: Adjust.
* tree-dfa.c: Adjust.
* tree-into-ssa.c: Adjust.
* tree-sra.c: Adjust.
* tree-ssa-alias.c: Adjust.
* tree-ssa-live.c: Adjust.
* tree-ssa.c: Adjust.
* tree-ssanames.c: Adjust.
* tree-tailcall.c: Adjust.

From-SVN: r170186