Set TREE_ADDRESSABLE when we need to borrow any expression

GCC requires VAR_DECL's and PARAM_DECL's to be marked with TREE_ADDRESSABLE
when the declaration will be used in borrow's ('&' getting the address).
This takes into account the implicit addresses when we do autoderef in
method resolution/operator-overloading.

This patch keeps a seperate side table for the VAR_DECL/PARAM_DECL hir-id's
for lookup. The typechecker marks these id's using

  AddressTakenResolver::SetAddressTaken (HIR::Expr&);

Its quite simple as it only cares about paths such as:

- PathInExpression
- QualifiedPathInExpression
- IdentifierExpression

The rest of the expression types will be folded into temporary values
anyway so they don't need to be marked as needs_address.

Fixes #804

0 files changed, 0 insertions, 0 deletions