[PATCH] prevents labels referenced in the exception table to be deleted

[Christian BRUEL]

Hello,

While running validations on the SH for PR target/42841, we found an 
issue with undefined labels, that happened to be landing pad entries 
deleted by reorg_redirect_jump.

The situation was that we had sh_reorg inserting a constant pool just
bellow a barrier, which happens to be before a landing pad (whose first
instruction was a jump), and creates a jump over the constant pool. Then 
reorg_redirect_jump (from dbr), deletes the label despite its reference 
in the exception table.

A label referenced in the exception table is not dead and should not be
deleted when jumps are merged, This patch just prevents this.

Regards

Christian




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