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Matthias Braun authored
This commit does: - Remove tarval_reachable+tarval_unreachable, dataflow analysis rather use top/bottom instead of other special values. - Rename tarval_undefined to tarval_unknown as it corresponds to the Unknown node (=a value which we don't know) - Remove predefined tarval_top/tarval_bottom from tv.h and place the defines into combo.c - Change compute_XXX constant folding functions to return tarval_unknown instead of tarval_bad if folding failed - compute_Unknown in combo results in tarval_bottom == tarval_unknown this eliminates strange special cases in the Cond/Switch rules and the now unnecessary cprop_X list.
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