[WebAssembly] Enable Wasm EH features only once (#124042) #122466 had an unexpected side effect that, `EnableFeaturesForWasmEHSjLj` and `BanIncompatibleOptionsForWasmEHSjLj` can be called multiple times now, every time a Wasm EH flag (`-fwasm-exceptions`, `-wasm-enable-eh`, `-wasm-enable-sjlj`, ..) was checked and handled. This resulted in unnecessarily adding the same feature-enabling arguments multiple times to the command line, for example, `-target-feature +exception-handling` could be added as many as three times, which didn't cause any errors but unnecessary. Also we ran `BanIncompatibleOptionsForWasmEHSjLj` more than once, which was harmless but unnecessary. This guards these functions with a static variable so that we only run them once.
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