Add --hot-func-list to llvm-profdata show for sample profiles
Add the --hot-func-list feature to llvm-profdata show for sample profiles. This feature prints a list of hot functions whose max sample count are above the 99% threshold, with their numbers of total samples, total samples percentage, max samples, entry samples, and their function names.
Reviewers: wenlei, hoyFB
Reviewed By: wenlei, hoyFB
Subscribers: hoyFB, wenlei, weihe, llvm-commits
Differential Revision: https://reviews.llvm.org/D82355