Erik Eckstein f5a8f600ea SIL: new instructions for copy-on-write support ...

* a new [immutable] attribute on ref_element_addr and ref_tail_addr
* new instructions: begin_cow_mutation and end_cow_mutation

These new instructions are intended to be used for the stdlib's COW containers, e.g. Array.
They allow more aggressive optimizations, especially for Array.

2020-05-14 08:39:54 +02:00

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