[llvm] [ValueTracking] Handle assume( trunc x to i1) (PR #118406)

[Yingwei Zheng via llvm-commits]

================
@@ -612,11 +612,16 @@ static bool isKnownNonZeroFromAssume(const Value *V, const SimplifyQuery &Q) {
     // Warning: This loop can end up being somewhat performance sensitive.
     // We're running this loop for once for each value queried resulting in a
     // runtime of ~O(#assumes * #values).
+    Value *Arg = I->getArgOperand(0);
+    if (match(Arg, m_TruncOrSelf(m_Specific(V))) &&
+        isValidAssumeForContext(I, Q.CxtI, Q.DT)) {
----------------
dtcxzyw wrote:

Looks like we hit another "ephemeral value" issue :( 


https://github.com/llvm/llvm-project/pull/118406