varasm.c: Include rtl-iter.h.

varasm.c: Include rtl-iter.h.

gcc/
	* varasm.c: Include rtl-iter.h.
	(const_rtx_hash_1): Take a const_rtx rather than an rtx *.
	Remove the pointer to the cumulative hashval_t and just return
	the hash for this rtx instead.  Remove recursive CONST_VECTOR case.
	(const_rtx_hash): Use FOR_EACH_SUBRTX instead of for_each_rtx.
	Accumulate the hashval_ts here instead of const_rtx_hash_1.

From-SVN: r214665