MSVC warnings when compiling Lua as C++

Hi, I feel like this topic is brought up every so often and not like it's m=
ajorly urgent, but I'll just throw it here.

As of the current latest commit (7579fc9d7ed90240487251dfb69168f8e64e9294),=
 there's the following warnings when compiling Lua as C++ with MSVC:

1>...\lua\lgc.c(488,21): warning C4334: '<<': result of 32-bit shift implic=
itly converted to 64 bits (was 64-bit shift intended?)
1>...\lua\lgc.c(577,21): warning C4334: '<<': result of 32-bit shift implic=
itly converted to 64 bits (was 64-bit shift intended?)
1>...\lua\lgc.c(792,19): warning C4334: '<<': result of 32-bit shift implic=
itly converted to 64 bits (was 64-bit shift intended?)
1>...\lua\lgc.c(811,23): warning C4334: '<<': result of 32-bit shift implic=
itly converted to 64 bits (was 64-bit shift intended?)
1>...\lua\ltable.c(389,10): warning C4334: '<<': result of 32-bit shift imp=
licitly converted to 64 bits (was 64-bit shift intended?)

And my 2 cents for the patch; in lobject.h on line 829:

-#define twoto(x)	(1u<<(x))
+#define twoto(x)	(1ull<<(x))

This change results in these warnings disappearing.

--=C2=A0Sainan

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