[Clang][AST] Fix extending an unsigned to signed in `ExprConstant.cpp` (#180563) Fixes #154713. The crash was due to `Index` sometimes being an unsigned 64-bit integer which was being zero-extended to a signed 64-bit, triggering an assertion failure in `APSInt::getExtValue`. This patch zero-extends it to a unsigned 64-bit integer instead, since `HandleLValueVectorElement` takes in a `uint64_t` anyway.
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