[llvm] [InstCombine] Set !prof metadata on Selects identified by add.ll test (PR #158743)

[Aiden Grossman via llvm-commits]

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@@ -185,6 +185,14 @@ inline uint32_t scaleBranchCount(uint64_t Count, uint64_t Scale) {
 LLVM_ABI void setExplicitlyUnknownBranchWeights(Instruction &I,
                                                 StringRef PassName);
 
+/// Like setExplicitlyUnknownBranchWeights(...), but only sets unknown branch
+/// weights in the new instruction if the parent function of the original
+/// instruction has function counts. This is to not confuse users by injecting
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boomanaiden154 wrote:

Nit: has function counts -> has an entry count

https://github.com/llvm/llvm-project/pull/158743