[tree-profiling]: Reenable MEM_REF

[Daniel Berlin]

The new SSA renamer doesn't like the fact that we were creating SSA
statements through force_gimple_operand when we lowered MEM_REF before
into-SSA.  This could be fixed by moving the lowering point (which i've
done, but not submitted a patch to do yet).

However, some stricter checks mean we need a no-ssa-name version of
force_gimple_operand in order to lower at -O0.

This patch reenables MEM_REF and adds force_gimple_operand_nossa to
lower without SSA.


Bootstrapped and regtested on i686-pc-linux-gnu, committed to
tree-profiling

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