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

PR debug/47106
PR debug/47402
* tree-flow.h (referenced_var_lookup): Add fn parameter.
Adjust all callers.
* tree-dfa.c (referenced_var_lookup): Use fn instead of cfun.
* tree-flow-inline.h: Adjust.
* gimple-pretty-print.c: Adjust.
* tree-into-ssa.c: Adjust.
* tree-ssa.c: Adjust.
* cfgexpand.c: Adjust.

From-SVN: r170185