llvm-project

a2b31109 - [clang] Reduce the small vector size for DeclTypeInfo. (#148788)

[clang] Reduce the small vector size for DeclTypeInfo. (#148788) The `Declarator` class is large (4584 bytes) and used as a stack-local variable during parsing. This patch reduces the default size of its `DeclTypeInfo` member, reducing the overall size down to 3880 bytes. This allows clang handle more deeply nested expressions without exhausting the stack. Combined with #148726, the nesting threshold for such expressions increases to `~1100`. No performance impact being [observed](https://llvm-compile-time-tracker.com/compare.php?from=d4f5ed6a23464cbe831820cb695aa1d39b11e4aa&to=66ba54b8a295cc2759387ef2a4a162de2ad4946e&stat=instructions:u).