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This means floatingpoint calculation in a firm graph must be performed
in the mode specified (and may not be performed in a wider mode as
before).

apparently abbrev number 0 is not allowed, so we have to start our
abbrev numbers at 1

Consecutive numbers can make it difficult to combine assembly output from
different compiler runs, which is done by the check/checkfile scripts to find
bugs in the SPEC suite.  If the number of basic blocks of a function changed
between compiler runs, the assembler will likely complain about duplicate labels.
Leaving a bit more space, e.g. 100, is a pragmatic fix.

Return the profile init irg from ir_profile_instrument() instead of guessing that it is the last irg.

We can now pull instructions from other blocks up and use the annul bits
if profitable.