Auto merge of #127638 - adwinwhite:cache_string, r=oli-obk

Add cache for `allocate_str`

Best effort cache for string allocation in const eval.

Fixes [rust-lang/miri#3470](https://github.com/rust-lang/miri/issues/3470).
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bors 2024-07-16 02:41:07 +00:00
commit 107e75d9b2

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