Remove TODO from a comment in System.Guid.cs (#88337)

Author: SwapnilGaikwad

src/libraries/System.Private.CoreLib/src/System/Guid.cs

@@ -1420,7 +1420,6 @@ private static (Vector128<byte>, Vector128<byte>, Vector128<byte>) FormatGuidVec
                     // Now we can create a "z" vector by selecting 12 values starting from the 9th element (index 0x08) and
                     // leaving gaps for dashes. Thus, the wider look-up table allows combining two shuffles, as used in the
                     // generic else-case, into a single instruction on Arm64.
-                    // TODO: Check if the JIT can merge the consecutive table look-ups and avoid the Arm64 specific if-case.
                     Vector128<byte> mid = AdvSimd.Arm64.VectorTableLookup((hexLow, hexHigh),
                         Vector128.Create(0x0D0CFF0B0A0908FF, 0xFF13121110FF0F0E).AsByte());
                     vecZ = (mid | dashesMask);