[PATCH] ASTVector: Fix return value of various insert() methods

[Will Dietz]

Error caught -fsanitize=pointer-overflow[1], curiously enough :).

The pointer overflow occurred when insert() was invoked with From==To,
which is done in quite a few places.  While std::vector::insert
requires [From,To) to be valid, it looks like here From==To is
intended to be supported[2], making the bug in the container not in
its use.

This patch fixes the overflow when From==To, as well as the return
value in this variant as well as the "fill" variant, changing them to
return an iterator pointing to the first of the inserted elements
(like SmallVector does).

See attached.

~Will

[1] Patches coming soon.
[2] See the implementation of append(), for example.
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