Remove some unnecessary crate dependencies.

Author: nnethercote

Diff for: Cargo.lock

@@ -4205,7 +4205,6 @@ dependencies = [
  "rustc_middle",
  "rustc_span",
  "rustc_target",
- "rustc_type_ir",
  "smallvec",
  "tracing",
 ]
@@ -4323,7 +4322,6 @@ dependencies = [
 name = "rustc_log"
 version = "0.0.0"
 dependencies = [
- "rustc_span",
  "tracing",
  "tracing-core",
  "tracing-subscriber",

Diff for: compiler/rustc_data_structures/Cargo.toml

@@ -12,7 +12,6 @@ elsa = "=1.7.1"
 ena = "0.14.3"
 indexmap = { version = "2.0.0" }
 jobserver_crate = { version = "0.1.28", package = "jobserver" }
-libc = "0.2"
 measureme = "11"
 rustc-hash = "1.1.0"
 rustc-rayon = { version = "0.5.0", optional = true }
@@ -41,6 +40,11 @@ features = [
     "Win32_System_Threading",
 ]
 
+[target.'cfg(unix)'.dependencies]
+# tidy-alphabetical-start
+libc = "0.2"
+# tidy-alphabetical-end
+
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]
 # tidy-alphabetical-start
 memmap2 = "0.2.1"

Diff for: compiler/rustc_infer/Cargo.toml

@@ -18,7 +18,6 @@ rustc_macros = { path = "../rustc_macros" }
 rustc_middle = { path = "../rustc_middle" }
 rustc_span = { path = "../rustc_span" }
 rustc_target = { path = "../rustc_target" }
-rustc_type_ir = { path = "../rustc_type_ir" }
 smallvec = { version = "1.8.1", features = ["union", "may_dangle"] }
 tracing = "0.1"
 # tidy-alphabetical-end

Diff for: compiler/rustc_log/Cargo.toml

@@ -11,11 +11,6 @@ tracing-subscriber = { version = "0.3.3", default-features = false, features = [
 tracing-tree = "0.3.1"
 # tidy-alphabetical-end
 
-[dev-dependencies]
-# tidy-alphabetical-start
-rustc_span = { path = "../rustc_span" }
-# tidy-alphabetical-end
-
 [features]
 # tidy-alphabetical-start
 max_level_info = ['tracing/max_level_info']