Remove unused dependencies (#3490)

* Remove unused dependencies in Cranelift

* add serde to the current workspace

* remove more unused dependencies in wasmtime?

cranelift/codegen/Cargo.toml

@@ -82,7 +82,6 @@ enable-serde = [
     "serde",
     "regalloc/enable-serde",
     "cranelift-entity/enable-serde",
-    "cranelift-codegen-shared/enable-serde"
 ]
 
 # Allow snapshotting regalloc test cases. Useful only to report bad register

cranelift/codegen/meta/Cargo.toml

@@ -14,7 +14,6 @@ edition = "2018"
 
 [dependencies]
 cranelift-codegen-shared = { path = "../shared", version = "0.78.0" }
-cranelift-entity = { path = "../../entity", version = "0.78.0" }
 
 [badges]
 maintenance = { status = "experimental" }

cranelift/codegen/shared/Cargo.toml

@@ -11,7 +11,3 @@ edition = "2018"
 [dependencies]
 # Since this is a shared dependency of several packages, please strive to keep this dependency-free
 # when no features are enabled.
-serde = { version = "1.0.94", features = ["derive"], optional = true }
-
-[features]
-enable-serde = ["serde"]