tree-optimization/120032 - CLZ matching, fallback for missing range-info

The following allows us to emit a conditional move when the value
of the table based CLZ/CLZ implementation at zero differs from what
the target implementation guarantees or we cannot easily fixup
otherwise.  In that case emit a val == 0 ? table-based-zero-result : ...

	PR tree-optimization/120032
	* tree-ssa-forwprop.cc (simplify_count_zeroes): When we cannot use
	the IFN to determine the result at zero use a conditional move
	to reproduce the correct result from the table-based
	algorithm.

	* gcc.target/i386/pr120032-3.c: New testcase.

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