fix: reject variable offsets that overflow uint32 bounds#2031
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Signed-off-by: Sai Asish Y <say.apm35@gmail.com>
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A variable offset whose
offset+sizewraps around uint32 slips past the bounds checks innewVariableandcheckUnsafeMemory, soVariablePointerindexes the backing slice out of range and panics. Both checks now use the existing overflow-safeMemory.boundshelper and return an error instead. Fixes #2028.