[lld] wasm-ld: Add allow-multiple-definition flag (PR #97699)

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``````````bash
git-clang-format --diff 843117050d63db6de983d4840ab3786f91c118b3 7e67621bbe9e126762233838fcf4e6b218ae5a50 -- lld/wasm/Config.h lld/wasm/Driver.cpp lld/wasm/SymbolTable.cpp
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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 3bc64b1ae3..06b0a71cf2 100644
--- a/lld/wasm/Driver.cpp
+++ b/lld/wasm/Driver.cpp
@@ -467,9 +467,8 @@ getBuildId(opt::InputArgList &args) {
 
 // Initializes Config members by the command line options.
 static void readConfigs(opt::InputArgList &args) {
-  config->allowMultipleDefinition =
-      args.hasFlag(OPT_allow_multiple_definition,
-                   OPT_no_allow_multiple_definition, false);
+  config->allowMultipleDefinition = args.hasFlag(
+      OPT_allow_multiple_definition, OPT_no_allow_multiple_definition, false);
   config->bsymbolic = args.hasArg(OPT_Bsymbolic);
   config->checkFeatures =
       args.hasFlag(OPT_check_features, OPT_no_check_features, true);

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https://github.com/llvm/llvm-project/pull/97699