CHECK_DEAD_NOTES abort in sched1 for sh-elf

[Jim Wilson]

Sanjiv Kumar Gupta, Noida wrote:
> I am not sure whether this is a problem with distribute_notes in combiner,
> or update_life_info in sched1.

It is a problem with distribute_notes in combine.

We are combining 3 instructions into two.  Pre combine, t is used and 
clobbered in i2.  Post combine, t is only used in i2, and not mentioned 
in i3.  That means we need to convert the REG_UNUSED note into a 
REG_DEAD note and put it on i2, but we have no code to do that.
-- 
Jim Wilson, GNU Tools Support, http://www.SpecifixInc.com