Add a compile command to Wasmtime.

This commit adds a `compile` command to the Wasmtime CLI.

The command can be used to Ahead-Of-Time (AOT) compile WebAssembly modules.

With the `all-arch` feature enabled, AOT compilation can be performed for
non-native architectures (i.e. cross-compilation).

The `Module::compile` method has been added to perform AOT compilation.

A few of the CLI flags relating to "on by default" Wasm features have been
changed to be "--disable-XYZ" flags.

A simple example of using the `wasmtime compile` command:

```text
$ wasmtime compile input.wasm
$ wasmtime input.cwasm
```

cranelift/codegen/meta/src/isa/arm64/mod.rs

@@ -8,6 +8,9 @@ use crate::cdsl::settings::{SettingGroup, SettingGroupBuilder};
 use crate::shared::Definitions as SharedDefinitions;
 
 fn define_settings(_shared: &SettingGroup) -> SettingGroup {
+    // Note: Wasmtime's `compile` command exposes these settings as CLI options
+    // If the settings change, please update src/commands/compile.rs to match.
+
     let mut setting = SettingGroupBuilder::new("arm64");
     let has_lse = setting.add_bool("has_lse", "Large System Extensions", false);
 

cranelift/codegen/meta/src/isa/x86/settings.rs

@@ -3,6 +3,9 @@ use crate::cdsl::settings::{PredicateNode, SettingGroup, SettingGroupBuilder};
 pub(crate) fn define(shared: &SettingGroup) -> SettingGroup {
     let mut settings = SettingGroupBuilder::new("x86");
 
+    // Note: Wasmtime's `compile` command exposes these settings as CLI options
+    // If the settings change, please update src/commands/compile.rs to match.
+
     // CPUID.01H:ECX
     let has_sse3 = settings.add_bool("has_sse3", "SSE3: CPUID.01H:ECX.SSE3[bit 0]", false);
     let has_ssse3 = settings.add_bool("has_ssse3", "SSSE3: CPUID.01H:ECX.SSSE3[bit 9]", false);
@@ -85,7 +88,7 @@ pub(crate) fn define(shared: &SettingGroup) -> SettingGroup {
     settings.add_predicate("use_lzcnt", predicate!(has_lzcnt));
 
     // Some shared boolean values are used in x86 instruction predicates, so we need to group them
-    // in the same TargetIsa, for compabitibity with code generated by meta-python.
+    // in the same TargetIsa, for compatibility with code generated by meta-python.
     // TODO Once all the meta generation code has been migrated from Python to Rust, we can put it
     // back in the shared SettingGroup, and use it in x86 instruction predicates.