Error handling after gimple statement insert.

[Matt Davis]

Hello,
In my compiler pass, I am inserting a new gimple call statement, and
then replacing the next call.  This usually works fine, and after I do
this, the gimple dump looks as I expect.  However, in one case, I
trigger gcc to abort in "remove_unreachable_handlers, at
tree-eh.c:3524"  this is for gcc 4.7.1.  When I perform the
gsi_insert() and gsi_replace() I maintain the EH data via setting the
'update_eh_info' argument to 'true' in the latter function call.  The
latter also updates the gimple statement, so I am really not sure what
else I should be doing.  Usually this works, but in one of my cases it
is failing.  I have not been able to pinpoint what is unique about the
failing case.  I am just looking for any insight.

Thanks!

-Matt