- simplified code
- deleted macros and useless casts
- fixed some debug messages

Fixed typo.

The warning arises from the removal of the barrier before peephole
optimization. An operand of the barrier is now kept by a new be_Keep
which is scheduled directly after the operand.

No functional change.

[r28460]

This simplifies the code and removes some divergencies between the CSE and
combo.

[r28459]

[r28458]

[r28457]

[r28454]

[r28453]

[r28447]

Difference of idx for Calls with no order relation is stable,
but may lead to circular dependencies. Fixed by looking at
the heights first.

Fixes backend/transform_loop.c (with -O0)

[r28436]

[r28435]

If a shift operation has a dependency operand (64bit shifts),
then instruction selection inserts a dependency edge between them,
so the scheduler orders them correctly. However, if the operand
is not used, the scheduler is confused about the dependency edge, which
is never resolved.

Fixes opt/longlong.c testcase

[r28434]