Fix integer overflow in FlatBufferBuilder#9145
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This commit addresses an integer overflow vulnerability in FlatBufferBuilder. Previously, the multiplication of len * elemsize was performed without validation, which could lead to heap out-of-bounds writes. I have introduced __builtin_mul_overflow checks in CreateUninitializedVector and StartVectorOfStructs to ensure memory allocation safety.
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This PR addresses a critical integer overflow vulnerability in FlatBufferBuilder where multiplication of len * elemsize was performed without validation. I have introduced __builtin_mul_overflow checks to ensure memory allocation safety and prevent heap out-of-bounds writes