Fix debug assert

Author: MihaZupan

src/libraries/System.Private.CoreLib/src/System/SearchValues/Strings/Helpers/StringSearchValuesHelper.cs

@@ -347,7 +347,7 @@ public static bool Equals<TValueLength>(ref char matchStart, ref readonly Single
                         // See comments on SingleStringSearchValuesPackedThreeChars.CanSkipAnchorMatchVerification.
                         // When running on Arm64, this helper is also used to confirm vectorized anchor matches.
                         // We do so because we're using UnzipEven when packing inputs, which may produce false positive anchor matches.
-                        Debug.Assert((matchStart & 0xFF) == state.Value[0]);
+                        Debug.Assert(TransformInput((char)(matchStart & 0xFF)) == state.Value[0]);
 
                         uint differentBits = (Unsafe.ReadUnaligned<uint>(ref matchByteStart) & CaseMask) - state.Value32_0;
                         differentBits |= (Unsafe.ReadUnaligned<uint>(ref Unsafe.Add(ref matchByteStart, state.SecondReadByteOffset)) & CaseMask) - state.Value32_1;
@@ -359,7 +359,7 @@ public static bool Equals<TValueLength>(ref char matchStart, ref readonly Single
                         // It's only used as part of the scalar search loop, which always checks that the first character matches before calling this helper.
                         // We know that the candidate is 2 or 3 characters long, and that the first character has already been checked.
                         // We only have to to check whether the last 2 characters also match.
-                        Debug.Assert(matchStart == state.Value[0], "This should only be called after the first character has been checked");
+                        Debug.Assert(TransformInput(matchStart) == state.Value[0], "This should only be called after the first character has been checked");
 
                         return (Unsafe.ReadUnaligned<uint>(ref Unsafe.Add(ref matchByteStart, state.SecondReadByteOffset)) & CaseMask) == state.Value32_1;
                     }