[lld] [lld][WebAssembly] Allow linker-synthetic symbols to be undefine when building shared libraries (PR #128223)

[via llvm-commits]

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``````````bash
git-clang-format --diff 449f84fea652e31de418c3087d7e3628809241b4 721563e08a704c04b3c7cb772472bc1c185e090b --extensions cpp,h -- lld/wasm/Driver.cpp lld/wasm/Symbols.h
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View the diff from clang-format here.
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``````````diff
diff --git a/lld/wasm/Driver.cpp b/lld/wasm/Driver.cpp
index 89b35ef8d6..ff047b15b6 100644
--- a/lld/wasm/Driver.cpp
+++ b/lld/wasm/Driver.cpp
@@ -988,7 +988,7 @@ static void createOptionalSymbols() {
 
   WasmSym::dsoHandle = symtab->addOptionalDataSymbol("__dso_handle");
 
-  auto addDataLayoutSymbol = [&](StringRef s) -> DefinedData* {
+  auto addDataLayoutSymbol = [&](StringRef s) -> DefinedData * {
     // Data layout symbols are either defined by the lld, or (in the case
     // of PIC code) defined by the dynamic linker / embedder.
     if (ctx.isPic) {

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https://github.com/llvm/llvm-project/pull/128223