Control spacing for attribute printing (#174197)
This was motivated by the decl printing for the alignas() keyword
attribute:
class alignas(1) Foo;
would be printed as:
class alignas(1) Foo;
with two spaces before class name.
Rather than trying to help `prettyPrintAttributes` guess what the caller
wants in terms of leading and trailing spaces, have it return an
`optional<string>` which is either the pretty-printed attributes for
Pos,
or `nullopt` if no attributes were found.
That way callers can compose and only print desired prefix/suffix if
they know there are attributes to print.
Add simple test cases for alignas.
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