FEXCore/OpcodeDispatcher: Fixes syscall instruction on Linux

I forgot on Linux by default we didn't have the syscall instructions
count as block end. Change this so that it counts as block end now.

This has the additional benefit that now the frontend needs to modify
the RIP manually as well which is fine as it's what arm64ec and wow64
does.

Also add back the UnimplementedOp in RDPID that accidentally got caught
up. Also increment DiskCache version as both changes will change
codegen.

Fixes #5942

FEXCore/include/FEXCore/Core/DiskCache.h

@@ -223,7 +223,7 @@ namespace DiskCache {
 
   // TODO: This header is in global installed header path, but uses internal headers.
   // Migrate this once that is fixed.
-  static constexpr uint16_t FormatVersion = 19;
+  static constexpr uint16_t FormatVersion = 20;
   FEX_DEFAULT_VISIBILITY uint16_t GetFormatVersion();
 
 } // namespace DiskCache