[type] [bug] Remove redundant component of bit pointer struct

[Hanke98]

Related issue = #1905 #2047

Bit pointer struct only needs two components (one for byte pointer and one for offset). But somehow another component was added in #2047. I removed it now.

taichi/taichi/codegen/codegen_llvm.cpp

Lines 1271 to 1279 in 6a96990

	// 1. get the bit pointer LLVM struct
	// struct bit_pointer {
	// i8* byte_ptr;
	// i32 offset;
	// };
	auto struct_type = llvm::StructType::get(
	*llvm_context, {llvm::Type::getInt8PtrTy(*llvm_context),
	llvm::Type::getInt32Ty(*llvm_context),
	llvm::Type::getInt32Ty(*llvm_context)});

As the comment described, it is not necessary to allocate two int32 components.

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