[Bug] [ir] Fix the IdentifyValuesUsedInOtherOffloads pass

[strongoier]

Related issue = #3463, #3467

#3467 didn't point out the accurate root cause of #3463. RangeForStmt was indeed visited with

taichi/taichi/ir/basic_stmt_visitor.cpp

Lines 33 to 36 in 1ca4c40

	void BasicStmtVisitor::visit(RangeForStmt *for_stmt) {
	preprocess_container_stmt(for_stmt);
	for_stmt->body->accept(this);
	}

instead of

taichi/taichi/transforms/offload.cpp

Lines 374 to 380 in 1ca4c40

	void visit(Stmt *stmt) override {
	int n_op = stmt->num_operands();
	for (int i = 0; i < n_op; i++) {
	auto op = stmt->operand(i);
	test_and_allocate(op);
	}
	}

Having this, the most effective way to fix #3467 is to fill in the preprocess_container_stmt() member function common to all container statements, which is done in this PR.

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[lin-hitonami]

LGTM!