Bump antlr4 from 4.8-1 to 4.9

[dependabot]

Bumps antlr4 from 4.8-1 to 4.9.

Release notes

Sourced from antlr4's releases.

4.9 New dart target, bug fixes, small enhancements

New DART target

Thanks to @lingyv-li, we have a DART target!

Issues fixed

• [Python3] Large import time cost paid for inline unittests ()
• Dart tests fail (target:dart)
• C++20 can not construct a std::string with a UTF-8 encoded string literal ()
• Warning in generated javascript code when using node 14 ()
• Python3 parser generation incorrect by ANTLR 4.7.1 and problem in Parser.py (target:python3)
• PHP target generates invalid output when $ is used as part of the literal in lexer rule (target:php)
• [C++][CMake] find_package() fails when the C++ runtime is make-install'ed ()
• [Go] Generated lexer and parser file names are always in lower case with underscore ()
• Syntax error in antlr4/runtime/Swift/boot.py (target:swift)

Improvements, features

• Avoid stepping through ANTLR generated code when debugging (C#) (target:csharp, type:improvement)
• replace gramamr with grammar (type:improvement)
• Dart Target (target:dart, type:improvement)

Pull requests grouped by target

csharp target

• Made C# Trace Listener usable for most cases (target:csharp)
• Avoid stepping through ANTLR generated code when debugging (C#) (target:csharp, type:improvement)
• refactored AntlrInputStream.cs by removing a redundand if-statement (target:csharp)
• Clarify and expand documentation for runtime ParseTreeWalker (target:csharp)
• [NullReferenceException in CSharp target #2304 ](antlr/antlr4#2375) (target:csharp)

cpp target

• cpp-target.md link broken fix (comp:doc, target:cpp)
• Fix linker issue when compiling Cpp runtime with CMake and MSVC on Windows (comp:build, target:cpp)
• Fix regressions in travis Cpp tests (target:cpp)
• Fix clang compile error with --stdlib=libc++ (target:cpp)
• [C++ runtime] Remove codecvt header (deprecated in C++17) in cpp runtime. (target:cpp)
• Fix C++ target README example (comp:doc, target:cpp)
• [C++ codegen] Add default cases to AltBlock and OptionalBlock (target:cpp)
• [C++ codegen] Remove use of the u8"" string literal prefix (target:cpp)
• [C++ codegen] Add explicit keyword to constructor (target:cpp)
• [C++ runtime] Fix static const ODR violations (target:cpp)
• [C++ runtime] Add AntlrInputStream(std::string_view) constructor (target:cpp)
• [C++ runtime] Improvements of Vocabulary::fromTokenNames (target:cpp)
• [C++ runtime]: Improve coding style of auto usages (target:cpp)
• C++ target: don't generate extra/duplicate semicolons (target:cpp)
• C++ target: escape ? character to prevent accidental trigraphs (target:cpp)
• Fixed link to CMake example in cpp-target.md (comp:doc, target:cpp)
• Update cpp-target.md doc (tree::ParseTreeWalker::DEFAULT is now a reference) (actions, target:cpp)
• Fix CMake packaging (target:cpp)
• [Fix #2727: improve setTokenFactory in Cpp target](antlr/antlr4#2733) (target:cpp)

... (truncated)

Commits

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