[lld] [lld][WebAssembly] Default to --stack-first (PR #166998)

[Derek Schuff via llvm-commits]

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@@ -44,5 +44,8 @@ MachO Improvements
 WebAssembly Improvements
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+- The `--stack-first` flag is now enabled by default. The old
+  behaviour can be enabled used `--no-stack-first`.
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dschuff wrote:

And optionally switch to "behavior" for more alignment with the rest of LLVM 😆 🇺🇸 

https://github.com/llvm/llvm-project/pull/166998