peepmatic: Be generic over the operator type

This lets us avoid the cost of `cranelift_codegen::ir::Opcode` to
`peepmatic_runtime::Operator` conversion overhead, and paves the way for
allowing Peepmatic to support non-clif optimizations (e.g. vcode optimizations).

Rather than defining our own `peepmatic::Operator` type like we used to, now the
whole `peepmatic` crate is effectively generic over a `TOperator` type
parameter. For the Cranelift integration, we use `cranelift_codegen::ir::Opcode`
as the concrete type for our `TOperator` type parameter. For testing, we also
define a `TestOperator` type, so that we can test Peepmatic code without
building all of Cranelift, and we can keep them somewhat isolated from each
other.

The methods that `peepmatic::Operator` had are now translated into trait bounds
on the `TOperator` type. These traits need to be shared between all of
`peepmatic`, `peepmatic-runtime`, and `cranelift-codegen`'s Peepmatic
integration. Therefore, these new traits live in a new crate:
`peepmatic-traits`. This crate acts as a header file of sorts for shared
trait/type/macro definitions.

Additionally, the `peepmatic-runtime` crate no longer depends on the
`peepmatic-macro` procedural macro crate, which should lead to faster build
times for Cranelift when it is using pre-built peephole optimizers.

Cargo.lock

@@ -386,11 +386,13 @@ dependencies = [
  "log",
  "peepmatic",
  "peepmatic-runtime",
+ "peepmatic-traits",
  "regalloc",
  "serde",
  "smallvec",
  "target-lexicon",
  "thiserror",
+ "wast 15.0.0",
 ]
 
 [[package]]
@@ -1298,20 +1300,23 @@ dependencies = [
  "peepmatic-automata",
  "peepmatic-macro",
  "peepmatic-runtime",
+ "peepmatic-test-operator",
+ "peepmatic-traits",
+ "serde",
  "wast 15.0.0",
  "z3",
 ]
 
 [[package]]
 name = "peepmatic-automata"
-version = "0.2.0"
+version = "0.66.0"
 dependencies = [
  "serde",
 ]
 
 [[package]]
 name = "peepmatic-fuzzing"
-version = "0.2.0"
+version = "0.66.0"
 dependencies = [
  "arbitrary",
  "bincode",
@@ -1322,6 +1327,8 @@ dependencies = [
  "peepmatic-automata",
  "peepmatic-runtime",
  "peepmatic-test",
+ "peepmatic-test-operator",
+ "peepmatic-traits",
  "rand 0.7.3",
  "serde",
  "wast 15.0.0",
@@ -1329,7 +1336,7 @@ dependencies = [
 
 [[package]]
 name = "peepmatic-macro"
-version = "0.2.0"
+version = "0.66.0"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1338,13 +1345,14 @@ dependencies = [
 
 [[package]]
 name = "peepmatic-runtime"
-version = "0.2.0"
+version = "0.66.0"
 dependencies = [
  "bincode",
  "bumpalo",
  "log",
  "peepmatic-automata",
- "peepmatic-macro",
+ "peepmatic-test-operator",
+ "peepmatic-traits",
  "serde",
  "serde_test",
  "thiserror",
@@ -1359,8 +1367,23 @@ dependencies = [
  "log",
  "peepmatic",
  "peepmatic-runtime",
+ "peepmatic-test-operator",
+ "peepmatic-traits",
 ]
 
+[[package]]
+name = "peepmatic-test-operator"
+version = "0.66.0"
+dependencies = [
+ "peepmatic-traits",
+ "serde",
+ "wast 15.0.0",
+]
+
+[[package]]
+name = "peepmatic-traits"
+version = "0.66.0"
+
 [[package]]
 name = "plain"
 version = "0.2.3"