[DebugInfo] Fix memory leak in DebugSSAUpdater (#159107) Fixes an issue in commit 3946c50, PR #135349. The DebugSSAUpdater class performs raw pointer allocations. It frees these properly in reset(), but does not do so in its destructor - as an immediate fix, this patch adds a destructor which frees the allocations correctly. I'll be merging this immediately to fix the issue, but will be open to post-commit review and/or producing a better fix in a follow-up commit.
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