[llubi] Add support for poison-generating/UB-implying annotations (#195339) This patch adds support for poison-generating/UB-implying annotations, including: 1. Parameter/retval attributes on function declarations and call sites (range/nofpclass/align/nonnull/noundef/dereferenceable[_or_null]). 2. Metadata (!range/!nofpclass/!align/!nonnull/!noundef/!dereferenceable[_or_null]) 3. Assume operand bundles (nonnull/align/dereferenceable[_or_null]) I put all of them into a single patch as they share most of the common logic. Note that there are two todos to reach the full support: 1. Load with `!noundef` metadata doesn't check undef bits for now. 2. !dereferenceable[_or_null] on load (and inttoptr) are not tested by this patch, as it needs the provenance support (https://github.com/llvm/llvm-project/pull/185977). But it should be fine as they are tested by metadata on call sites.
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