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# 476ced4b 14-Jun-2022 Florian Mayer <[email protected]>

[MTE] [HWASan] Support diamond lifetimes.

We were overly conservative and required a ret statement to be dominated
completely be a single lifetime.end marker. This is quite restrictive
and leads to

[MTE] [HWASan] Support diamond lifetimes.

We were overly conservative and required a ret statement to be dominated
completely be a single lifetime.end marker. This is quite restrictive
and leads to two problems:

* limits coverage of use-after-scope, as we degenerate to
use-after-return;
* increases stack usage in programs, as we have to remove all lifetime
markers if we degenerate to use-after-return, which prevents
reuse of stack slots by the stack coloring algorithm.

Reviewed By: eugenis

Differential Revision: https://reviews.llvm.org/D127905

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Revision tags: llvmorg-14.0.5, llvmorg-14.0.4, llvmorg-14.0.3, llvmorg-14.0.2, llvmorg-14.0.1, llvmorg-14.0.0, llvmorg-14.0.0-rc4, llvmorg-14.0.0-rc3, llvmorg-14.0.0-rc2, llvmorg-14.0.0-rc1
# f7a6c341 02-Feb-2022 Florian Mayer <[email protected]>

[mte] support more complicated lifetimes (e.g. for exceptions).

Reviewed By: eugenis

Differential Revision: https://reviews.llvm.org/D118848