[commit/6.2] Fix gdb1555 regression on GNU/Linux PPC

[Andrew Cagney]

It turns out that the assertions in insert_step_resume_breakpoint no 
longer apply.  Originally this was only called when single-stepping into 
a function from code with debug info.  It's now also called when 
stepping into/out-of trampolines so that the assertions are no longer valid.

This patch removes the assertions and updates the description.

As the subject says, gdb1555 on GNU/Linux PPC passes again.
Committed to mainline and 6.2 branch.

Andrew

PS: It bothers me that this generic bug didn't trigger on i386, I'll 
revamp that test.
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