tail calls: fix copying non-scalar arguments to callee #150473
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☔ The latest upstream changes (presumably #150565) made this pull request unmergeable. Please resolve the merge conflicts. |
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Alternative to #144933: when invoking a tail call with a non-scalar argument, we need to delay freeing the caller's local variables until after the callee is initialized, so that we can copy things from the caller to the callee.
Fixes #144820... but as the FIXMEs in the code show, it's not clear to me whether these are the right semantics.
r? @WaffleLapkin