Revert "Fix: On wasm targets, call panic_in_cleanup if panic occurs in cleanup"

This reverts commit acbfd79acf.

compiler/rustc_codegen_gcc/src/builder.rs

@@ -1656,10 +1656,6 @@ fn catch_switch(
         unimplemented!();
     }
 
-    fn get_funclet_cleanuppad(&self, _funclet: &Funclet) -> RValue<'gcc> {
-        unimplemented!();
-    }
-
     // Atomic Operations
     fn atomic_cmpxchg(
         &mut self,