AK: Make Vector::try_* functions return ErrorOr<void>

Instead of signalling allocation failure with a bool return value
(false), we now use ErrorOr<void> and return ENOMEM as appropriate.
This allows us to use TRY() and MUST() with Vector. :^)

Userland/Libraries/LibWasm/AbstractMachine/AbstractMachine.h

@@ -311,7 +311,7 @@ public:
                 return false;
         }
         auto previous_size = m_elements.size();
-        if (!m_elements.try_resize(new_size))
+        if (m_elements.try_resize(new_size).is_error())
             return false;
         for (size_t i = previous_size; i < m_elements.size(); ++i)
             m_elements[i] = fill_value;