Alex Hoppen 66374a14ea [libSyntax] Make RawSyntax nodes hold a strong reference to their arena ...

This allows an elegant design in which we can still allocate RawSyntax
nodes using a bump allocator but are able to automatically free that
buffer once the last RawSyntax node within that buffer is freed.

This also resolves a memory leak of RawSyntax nodes that was caused by
ParserUnit not freeing its underlying ASTContext.

2018-08-24 08:39:54 -07:00

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