Adjustments to sqlite3MemoryBarrier() when compiling with MSVC and/or WinCE.

FossilOrigin-Name: 3168326ebfa1c961d8fc6435453b02be23d910cc

src/sqliteInt.h

@@ -196,6 +196,7 @@
 #      include <intrin.h>
 #      pragma intrinsic(_byteswap_ushort)
 #      pragma intrinsic(_byteswap_ulong)
+#      pragma intrinsic(_ReadWriteBarrier)
 #    else
 #      include <cmnintrin.h>
 #    endif