Fix LLVMExtDIBuilderCreateArrayType argument alignInBits should be UInt64

[lbguilherme]

The LLVMExtDIBuilderCreateArrayType is defined as this on llvm_ext.cc:

LLVMMetadataRef LLVMExtDIBuilderCreateArrayType(
    DIBuilderRef Dref, uint64_t Size, uint64_t AlignInBits,
    LLVMMetadataRef Type, LLVMMetadataRef Subs) {
      return wrap(Dref->createArrayType(Size, AlignInBits, unwrapDI<DIType>(Type), DINodeArray(unwrapDI<MDTuple>(Subs))));
}

But is then imported as this:

  fun di_builder_create_array_type = LLVMExtDIBuilderCreateArrayType(builder : DIBuilder, size : UInt64,
                                                                     alignInBits : UInt32, ty : LibLLVM::MetadataRef,
                                                                     subscripts : LibLLVM::MetadataRef) : LibLLVM::MetadataRef

There is a mismatch in the type of the alignInBits argument.