Add go1.24 to compatibility set and test matrix.
Remove go1.21 from test matrix.
TestRangeOverFuncNextInlined is disabled because the improved inlining
of go1.24 produces symbol names that are too complicated for us to
correlate, a fix for this will require a change to the compiler that
will probably be too complex to make it into 1.24.
The step command is changed such that when the function being currently
called is a coroutine switch function it will move to the associated
coroutine.
Functions that switch coroutines are currently the next, stop and yield
closures produced by the iter.Pull function.
TestRangeOverFuncNext and TestRangeOverFuncNextInlined are failing on
linux/386 with go1.23 due to an inconsistency on how append works on
32bit platforms.
Fixes a repeated stop on the first line of a range-over-func body when
stepping through a program. The entry point breakpoint is changed to a
special breakpoint that, when hit:
- clears the current temporary breakpoints
- sets breakpoints like 'next' would, and
- resumes execution.
Move all tests of the functionality of proc.next,
proc.(*TargetGroup).Next, proc.(*TargetGroup).Step,
proc.(*TargetGroup).StepOut to their own test file.
