[Attributor] Initialize effectively unused value to appease UBSAN

diff --git a/llvm/lib/Transforms/IPO/AttributorAttributes.cpp b/llvm/lib/Transforms/IPO/AttributorAttributes.cpp
index 91f57a84fd1e32c625b209c0e344e986d100046f..98bce21cf96538698666bbabc0667cd469cccb9d 100644 (file)
--- a/llvm/lib/Transforms/IPO/AttributorAttributes.cpp
+++ b/llvm/lib/Transforms/IPO/AttributorAttributes.cpp
@@ -5144,7 +5144,7 @@ struct AAValueSimplifyImpl : AAValueSimplify {
       if (isa<ConstantPointerNull>(Obj)) {
         // A null pointer access can be undefined but any offset from null may
         // be OK. We do not try to optimize the latter.
-        bool UsedAssumedInformation;
+        bool UsedAssumedInformation = false;
         if (!NullPointerIsDefined(L.getFunction(),
                                   Ptr.getType()->getPointerAddressSpace()) &&
             A.getAssumedSimplified(Ptr, AA, UsedAssumedInformation) == Obj)