Fixing behavior for iSimdVector helper

Author: DeepakRajendrakumaran

src/libraries/System.Private.CoreLib/src/System/Runtime/Intrinsics/Vector128_1.cs

@@ -694,8 +694,7 @@ private string ToString([StringSyntax(StringSyntaxAttribute.NumericFormat)] stri
 
         static bool ISimdVector<Vector128<T>, T>.AnyMatches(Vector128<T> vector)
         {
-            uint mask = vector.ExtractMostSignificantBits();
-            return (mask != 0);
+            return (vector != Vector128<T>.Zero);
         }
 
         static int ISimdVector<Vector128<T>, T>.IndexOfLastMatch(Vector128<T> vector)

src/libraries/System.Private.CoreLib/src/System/Runtime/Intrinsics/Vector256_1.cs

@@ -684,8 +684,7 @@ private string ToString([StringSyntax(StringSyntaxAttribute.NumericFormat)] stri
 
         static bool ISimdVector<Vector256<T>, T>.AnyMatches(Vector256<T> vector)
         {
-            uint mask = vector.ExtractMostSignificantBits();
-            return (mask != 0);
+            return (vector != Vector256<T>.Zero);
         }
 
         static int ISimdVector<Vector256<T>, T>.IndexOfLastMatch(Vector256<T> vector)

src/libraries/System.Private.CoreLib/src/System/Runtime/Intrinsics/Vector512_1.cs

@@ -684,8 +684,7 @@ private string ToString([StringSyntax(StringSyntaxAttribute.NumericFormat)] stri
 
         static bool ISimdVector<Vector512<T>, T>.AnyMatches(Vector512<T> vector)
         {
-            ulong mask = vector.ExtractMostSignificantBits();
-            return (mask != 0);
+            return (vector != Vector512<T>.Zero);
         }
 
         static int ISimdVector<Vector512<T>, T>.IndexOfLastMatch(Vector512<T> vector)

src/libraries/System.Private.CoreLib/src/System/Runtime/Intrinsics/Vector64_1.cs

@@ -759,8 +759,7 @@ private string ToString([StringSyntax(StringSyntaxAttribute.NumericFormat)] stri
 
         static bool ISimdVector<Vector64<T>, T>.AnyMatches(Vector64<T> vector)
         {
-            uint mask = vector.ExtractMostSignificantBits();
-            return (mask != 0);
+            return (vector != Vector64<T>.Zero);
         }
 
         static int ISimdVector<Vector64<T>, T>.IndexOfLastMatch(Vector64<T> vector)

src/libraries/System.Private.CoreLib/src/System/Text/Ascii.Utility.cs

@@ -2204,7 +2204,7 @@ private static unsafe bool HasMatch<TVectorByte>(TVectorByte vector)
             {
                 return VectorContainsNonAsciiChar((Vector128<byte>)(object)vector);
             }
-            return TVectorByte.AnyMatches(vector);
+            return ((vector & TVectorByte.Create((byte)0b1000_0000)) != TVectorByte.Zero);
         }