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We only use control flow scc analysis.

Previously a Bad node was returned which could hide problems and more
importantly you create new nodes (the BadBB) in an operation that apparently
only queries the graph.

also removed some assert(0) used in verifiers to stop when compiling
with assertions (you better use your debugger to stop and keep the code
clean)

It has been empty for nearly all systems. People who used to put stuff
in config.h can still create a config.h on their own and inject
-include (gcc) or /FI (msvc) into their CPPFLAGS.

Just state the copyright and the project the files belong to. You can
then find the COPYING file for the whole project.

cleanup: Remove pointless assert(is_${NODE}(x)) just before get_${NODE}_${FOO}(x), which do the same assert.

graph_properties are things that a transformation may destroy but which
can be easily recalculated.

graph_constraints are set after lowering phases have been running and
forbid certain constructs that no (later) transformation is allowed to construct

It should only be used by construction algorithms

public functions are already documented in their headers, no need to
repeat the comment at the definition site.

[r28338]

[r28337]

[r28330]

[r28272]

[r28127]

[r27762]

- rework ir_phase API
(sorry for mixing these 2 things into 1 commit)

[r27285]

[r27277]

[r27145]

[r26468]

[r24124]

[r22889]

[r22754]

[r22563]

[r22377]

[r20868]

[r19598]