[tree-profiling]: A few small MEM_REF cleanups

[Daniel Berlin]

in preparation for moving MEM_REF to the mainline, i've made a few
cleanups.

force_gimple_operand_nossa is no more, it was replaced by an in_ssa_p
use in force_gimple_operand.

MEM_REF is now counted as a pointer dereference and lowering mem_ref was
moved to after SSA to make sure all the code in tree-ssa-operands, etc
is used for testing purposes.


Bootstrapped and regtested on i686-pc-linux-gnu.



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