ssr: Allow replacing expressions with statements

Now that statements can be matched and replaced (#6587) some usecases
require expressions to be replaced with statements as well. This happens
when something that can ambiguously be an expression or statement like
`if` and loop blocks appear in the last position of a block, as trailing
expression. In this case a replacement pattern of the form `if
foo(){$a();}==>>$a();` will only substitute `if` blocks in the list of
statements but not if they (implicitly) end up in the trailing
expression, where they are not wrapped by an EXPR_STMT (but the pattern
and template are, as parsing only succeeds for the `stmt ==>> stmt`
case).

Instead of adding two rules that match an expression - and emit
duplicate matching errors - allow the template for expressions to be a
statement if it fails to parse as an expression.

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