BytecodeBuilder.cpp: fix invalid assumption that int32_t aliases int (#…

…1347)

I found that Luau failed to build on the devkitPro toolchain for 3DS.

This target uses an ILP32 model, and `int32_t` is an alias of `long`.
`BytecodeBuilder.cpp` includes a line where an `int` is passed by
reference to a function expecting an `int32_t`.

Compiler/src/BytecodeBuilder.cpp

@@ -1836,7 +1836,7 @@ void BytecodeBuilder::dumpConstant(std::string& result, int k) const
     }
     case Constant::Type_Import:
     {
-        int id0 = -1, id1 = -1, id2 = -1;
+        int32_t id0 = -1, id1 = -1, id2 = -1;
         if (int count = decomposeImportId(data.valueImport, id0, id1, id2))
         {
             {