[AssumptionCache] Deduplicate affected values in removeAffectedValues (#205441) removeAffectedValues can encounter duplicate entries in the Affected list when a separate_storage bundle uses the same pointer for both arguments (e.g. "separate_storage"(ptr %p, ptr %p)). The duplicate entries share both the same value and the same bundle index. The first iteration handles the value completely and may erase the AffectedValues entry, causing the second iteration to fail the assertion. This patch deduplicates entries in removeAffectedValues by (Value *, Index) pair, matching the deduplication already done in updateAffectedValues. This also fixes the ExpectedMatches counting in the debug logic added by #205275, which otherwise miscounts when duplicates are present. Fixes #205378.
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