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This patch extends the canonicalization printing policy to cover expressions and template names, and wires that up to the template argument printer, covering expressions, and to the expression within a dependent decltype. This is helpful for debugging, or if these expressions somehow end up in diagnostics, as without this patch they can print as completely unrelated expressions, which can be quite confusing. This is because expressions are not uniqued, unlike types, and when a template specialization containing an expression is the first to be canonicalized, the expression ends up appearing in the canonical type of subsequent equivalent specializations. Fixes https://github.com/llvm/llvm-project/issues/92292