I've consolidated the implementations of
operator new and
operator delete on a couple dozen classes which are always allocated in the AST context. On main, these now inherit from an
ASTAllocated base class which formalizes this pattern.
If you're working on a PR which adds a new AST-owned class to Swift, please update it to use this, and if you spot an
operator new for ASTContext that I've missed, please update that too.