[llvm] [llvm-profdata] Do not create numerical strings for MD5 function names read from a Sample Profile. (PR #66164)

[William Junda Huang via llvm-commits]

huangjd wrote:

Full profile load is further reduced to 24s after optimizing lazy loading of name table, which was a bottleneck

https://github.com/llvm/llvm-project/pull/66164