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They have been unnecessary aliases for is_SymConst_addr_ent() and
get_SymConst_entity().

The new interface uses no complicated callbacks anymore, but is a simple
ir_node* -> void* nodemap. Adapted all users of ir_phase for this.

From the manpage: If c is not an unsigned char value, or EOF, the
behavior of these functions is undefined.
(So putting char into them directly is wrong)

This simplifies the code and should make it slightly faster

This fixes backend/builtin_parityl.c and backend/builtin_parityll.c.

If the peephole replaced the current node by another node
the corresponding value is live before the current node.

This fixes x86code/flags.c.

(see testsuite/backend/sparc_notconsts.c for an example)