a255c1ed36
WebAssemblyLateEHPrepare::addCatchRefsAndThrowRefs was using
Catch->getIterator()->getNextNode() to find the insertion position
after the CATCH (or CATCH_ALL) instruction in an EH pad.
If the CATCH/CATCH_ALL instruction is the last instruction in the basic
block, getNextNode() returns nullptr, which causees a crash when passed
to BuildMI. This patch fixes it by using std::next(Catch->getIterator())
which returns MBB.end() if the catch is the last instruction, and the
overload of BuildMI that takes an iterator correctly handles BB.end().
Fixes #197077
Assisted-By: Gemini
(cherry picked from commit
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