Revert "Revert "[msan] Switch to -msan-handle-icmp-exact my default"" (#113379)

Reverts #113376

Fixed with #113378

Author: vitalybuka

llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp

@@ -276,7 +276,7 @@ static cl::opt<bool>
 static cl::opt<bool>
     ClHandleICmpExact("msan-handle-icmp-exact",
                       cl::desc("exact handling of relational integer ICmp"),
-                      cl::Hidden, cl::init(false));
+                      cl::Hidden, cl::init(true));
 
 static cl::opt<bool> ClHandleLifetimeIntrinsics(
     "msan-handle-lifetime-intrinsics",