Handle parsing of unary expressions involving &, ~, *, - and ! according to WGSL spec.
<rdar://problem/105380466>
Pull request: https://github.com/WebKit/WebKit/pull/10019
Committed 260232@main (0141851d6398): <https://commits.webkit.org/260232@main> Reviewed commits have been landed. Closing PR #10019 and removing active labels.