string.EndsWith use SequenceEqual not SequenceCompareTo (#22207)

Author: benaadams

src/System.Private.CoreLib/shared/System/String.Comparison.cs

@@ -566,7 +566,8 @@ public bool EndsWith(string value, StringComparison comparisonType)
                     return CompareInfo.Invariant.IsSuffix(this, value, GetCaseCompareOfComparisonCulture(comparisonType));
 
                 case StringComparison.Ordinal:
-                    return this.Length < value.Length ? false : (CompareOrdinalHelper(this, this.Length - value.Length, value.Length, value, 0, value.Length) == 0);
+                    int offset = this.Length - value.Length;
+                    return (uint)offset <= (uint)this.Length && this.AsSpan(offset).SequenceEqual(value);
 
                 case StringComparison.OrdinalIgnoreCase:
                     return this.Length < value.Length ? false : (CompareInfo.CompareOrdinalIgnoreCase(this, this.Length - value.Length, value.Length, value, 0, value.Length) == 0);