[WebAssembly] Generate invokes with llvm.wasm.(re)throw (#128105)

Even though `__builtin_wasm_throw`, which is lowered down to
`llvm.wasm.throw`, throws,
```cpp
try {
  __builtin_wasm_throw(0, obj);
} catch (...) {
}
```
does not generate `invoke`. This is because we have assumed the
intrinsic cannot be invoked, which doesn't make much sense. (See #128104
for the historical context)

#128104 made `llvm.wasm.throw` intrinsic invokable in the backend. This
actually generates `invoke`s in Clang for `__builtin_wasm_throw`.

While we're at it, this also generates `invoke`s for
`__builtin_wasm_rethrow`, which is actually not used anywhere in C++
support. I haven't deleted it just in case in may have uses later. (For
example, to support rethrow functionality that carries stack trace with
exnref)

Depends on #128104 for the CI to pass.
Fixes #124710.

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