v8.1

This is a point release to get some bug fixes out.

Fixes

• The restriction on interface instances targeted by defparams not being allowed with virtual interfaces was also erroneously applied to interface port connections
• Fixed a null pointer crash in slang-tidy (thanks to @rhanqtl)
• Fixed a bug that could cause infinite recursion when instantiating bind targets that force elaboration due to wildcard package imports
• Fixed the handling of disable region directives declared in block comments (as opposed to single line comments which were working fine)
• Fixed a spurious error when cycle delays are used in an uninstantiated context that does not have default clocking specified
• Fixed an issue with how checker formal ports are looked up from within checker instances
• Fixed ICE with conditional statements that have pattern matching along with a named statement block
• Recursive typedef declarations now properly report an error instead of crashing
• Fixed several issues that led to invalid builds on Linux with LTO enabled
• Fixed a case where no diagnostic would be issued when incorrectly referring to an instance array element from within an expression
• Fixed SyntaxPrinter printing of directives that have skipped leading trivia
• Fixed rewiring of interface array port connections with opposite declared range directions
• Fixed a bug in the constant evaluation of division between two positive signed integers; the sign flag was lost and the result was always treated as unsigned
• Fixed JSON serialization of definition symbol attributes
• The --obfuscate-ids option has been fixed to not generate invalid SystemVerilog names that start with a digit (thanks to @Sustrak)
• Fixed slang-tidy's module instantiation prefix check to use the correct diagnostic (thanks to @corco)
• Fixed $static_asserts triggering in uninstantiated contexts (thanks to @AndrewNolte)
• Fixed --allow-use-before-declare to apply to wildcard port connection expressions