release_v3.12

What's Changed

• Emit one type definition for declarators that share it by @Cherith1222 in #621
• raise ParseError for _Atomic applied to array or function type by @arfa-21 in #623
• Fix code generation for the _Pragma operator by @hulkbig in #625
• Parse GNU statement expressions as primary expressions by @hulkbig in #628
• Fix shared type declarations in switch cases by @hulkbig in #630
• raise ParseError for typedef in a parameter declaration by @arfa-21 in #631
• Scope for loop init declarations to the loop by @arfa-21 in #634

Full Changelog: release_v3.11...release_v3.12