[clang] [lld] [llvm] [LLVM][WebAssembly] Implement branch hinting proposal (PR #146230)

[Alexis Engelke via cfe-commits]

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@@ -28,6 +33,9 @@ class LLVM_LIBRARY_VISIBILITY WebAssemblyAsmPrinter final : public AsmPrinter {
   WebAssemblyFunctionInfo *MFI;
   bool signaturesEmitted = false;
 
+  // vec idx == local func_idx
+  std::vector<std::optional<BranchHintRecord>> branchHints;
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aengelke wrote:

Use SmallVector. Why wrap it in optional, shouldn't an empty hint vector indicate the same?

https://github.com/llvm/llvm-project/pull/146230