NEW DELHI, Jan 15 : India's top court is set to rule on Thursday if taxes should be levied on U.S. investment firm Tiger Global's $1.6 billion stake sale in Flipkart to Walmart in 2018, in what could be a landmark ruling on international tax-treaty use by firms. Keenly watched by foreign investors, the legal dispute relates to how Tiger Global used the India–Mauritius tax treaty to claim tax exemptions and New Delhi's fierce objections to it. The ruling will have implications for how India