[llvm] [lld] [clang] Embed the command line arguments during LTO (PR #79390)

[Sam Clegg via cfe-commits]

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@@ -40,6 +41,7 @@ using namespace llvm;
 namespace lld::wasm {
 static std::unique_ptr<lto::LTO> createLTO() {
   lto::Config c;
+  c.EmbedCmdArgs = commonContext().cmdArgs;
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sbc100 wrote:

(I'm not sure why `context()` needs to take a template param, and it looks like its optional.. none of the current uses seem to specify one).

https://github.com/llvm/llvm-project/pull/79390