Add Slice.mismatch method

There are couple of places in Trino that are looking for longest prefix between two byte[] arrays

src/main/java/io/airlift/slice/Slice.java

@@ -1075,7 +1075,7 @@ public int compareTo(int offset, int length, Slice that, int otherOffset, int ot
         }
 
         // Find index of the first mismatched byte
-        long mismatch = MemorySegment.mismatch(segment, offset, offset + length, that.segment, otherOffset, otherOffset + otherLength);
+        long mismatch = mismatch(offset, length, that, otherOffset, otherLength);
         if (mismatch == -1) {
             return 0;
         }
@@ -1088,6 +1088,16 @@ public int compareTo(int offset, int length, Slice that, int otherOffset, int ot
         return Byte.compareUnsigned(segment.get(BYTE, offset + mismatch), that.segment.get(BYTE, otherOffset + mismatch));
     }
 
+    public int mismatch(int offset, int length, Slice that, int otherOffset, int otherLength)
+    {
+        return toIntExact(MemorySegment.mismatch(segment, offset, offset + length, that.segment, otherOffset, otherOffset + otherLength));
+    }
+
+    public int mismatch(Slice that)
+    {
+        return mismatch(0, length(), that, 0, that.length());
+    }
+
     /**
      * Compares the specified object with this slice for equality.  Equality is
      * solely based on the contents of the slice.
@@ -1237,7 +1247,7 @@ public ByteBuffer toByteBuffer(int offset, int length)
             return EMPTY_BYTE_BUFFER;
         }
 
-        return segment.asByteBuffer().slice(offset, length);
+        return segment.asSlice(offset, length).asByteBuffer();
     }
 
     public ByteBuffer toByteBuffer(int offset)

src/test/java/io/airlift/slice/TestSlice.java

@@ -313,6 +313,41 @@ public void testInt()
         }
     }
 
+    @Test
+    public void testMismatch()
+    {
+        Slice first = Slices.utf8Slice("ala ma kota");
+        Slice second = Slices.utf8Slice("ala ma psa");
+
+        int mismatch = first.mismatch(second);
+        assertThat(mismatch).isEqualTo(7);
+
+        assertThat(first.toStringUtf8().substring(0, mismatch))
+                .isEqualTo(second.toStringUtf8().substring(0, mismatch));
+
+        assertThat(first.toStringUtf8().substring(0, mismatch + 1))
+                .isNotEqualTo(second.toStringUtf8().substring(0, mismatch + 1));
+
+        // Different slices
+        assertThat(first.mismatch(utf8Slice("pies i kot")))
+                .isEqualTo(0);
+
+        assertThat(first.mismatch(0, first.length(), second, 5, second.length() - 5))
+                .isEqualTo(1);
+
+        assertThat(first.mismatch(first))
+                .isEqualTo(-1);
+
+        assertThat(second.mismatch(second))
+                .isEqualTo(-1);
+
+        assertThat(first.slice(0, mismatch).mismatch(second.slice(0, mismatch)))
+                .isEqualTo(-1);
+
+        assertThat(first.mismatch(0, mismatch, second, 0, mismatch))
+                .isEqualTo(-1);
+    }
+
     private static void assertInt(Slice slice, int index)
     {
         // fill slice with FF