[DWARFVerifier] Verify that DW_AT_LLVM_stmt_sequence is set correctly (#152807)
Sometimes DW_AT_LLVM_stmt_sequence won't point to the correct offset.
This feature helps us debug when/where it went wrong.
Added a new test and manually tempered with the value to show the
intended verification result.
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Signed-off-by: Peter Rong <PeterRong@meta.com>