[llvm] [WPD] set the branch funnel function entry count (PR #155657)

[Peter Collingbourne via llvm-commits]

pcc wrote:

Branch funnel functions can't be inlined (see https://reviews.llvm.org/D45116) so I'm not sure that it's worth going to the effort of making the entry count accurate. Could we do something simpler here where we mark the calls with an unknown entry count?

https://github.com/llvm/llvm-project/pull/155657