Optimize generated code via the CLI by default (#973)

* Optimize generated code via the CLI by default

This commit updates the behavior of the CLI and adds a new flag. It
first enables the `--optimize` flag by default, ensuring that usage of
the `wasmtime` CLI will enable cranelift optimizations by default. Next
it also adds a `--opt-level` flag which is similar to Rust's
`-Copt-level` where it takes a string argument of how to optimize. This
is updates to support 0/1/2/s, where 1 is currently the same as 2 but
added for consistency with other compilers. The default setting is
`--opt-level=2`.

When the `-O` flag is not passed the `--opt-level` flag is used,
otherwise `-O` takes precedent in the sense that it implies
`--opt-level=2` which is the highest optimization level. The thinking is
that these flags will in general select the highest optimization level
specified as the final optimization level.

* Add inline docs

* fix a test

tests/debug/obj.rs

@@ -16,7 +16,7 @@ pub fn compile_cranelift(
         target.as_ref(),
         Strategy::Cranelift,
         false,
-        false,
+        wasmtime::OptLevel::None,
         true,
         output
             .as_ref()