[llvm] Insert symbols for prefetch targets read from basic blocks section profile. (PR #168439)

[Wei Xiao via llvm-commits]

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@@ -202,6 +218,9 @@ class BasicBlockSectionsProfileReaderWrapperPass : public ImmutablePass {
   std::pair<bool, FunctionPathAndClusterInfo>
   getFunctionPathAndClusterInfo(StringRef FuncName) const;
 
+  SmallVector<CallsiteID>
+  getPrefetchTargetsForFunction(StringRef FuncName) const;
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williamweixiao wrote:

how about changing it to below one?
`const SmallVector<CallsiteID> &getPrefetchTargetsForFunction(StringRef FuncName) const;`

https://github.com/llvm/llvm-project/pull/168439