[PR C/79116] ICE with CilkPlus array notation and _Cilk_for (C front-end)

[Aldy Hernandez <aldyh at redhat dot com>]

This is the same as pr70565 but it fails in an entirely different manner 
in the C front-end.

The problem here is that the parser builds an ARRAY_NOTATION_REF with a 
type of ptrdiff for length and stride.  Later in 
cilkplus_extract_an_triplets we convert convert length and stride to an 
integer_type_node.  This causes create_array_refs() to use a stride of 
integer_type, while the start is still a ptrdiff (verify_gimple ICE, boom).

The attached patch converts `start' to an integer_type to match the 
length and stride.  We could either do this, or do a fold_convert if 
!useless_type_conversion_p in create_array_refs.  I didn't want to look 
into cilkplus too deeply as to why we have different types, because (a) 
I don't care (b) we're probably going to deprecate Cilk Plus, no?

OK?

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