Rollup merge of rust-lang#161259 - mejrs:attr_structures, r=JonathanBrouwer

move some attribute related structs out of rustc_attr_ir

This changes it so that

- rustc_session no longer depends on rustc_attr_ir
- rustc_attr_ir no longer depends on rustc_target (which is a fairly sizeable crate)
- rustc_attr_ir and rustc_target can compile in parallel

Previous graph:
<img width="985" height="512" alt="image" src="https://github.com/user-attachments/assets/cbde2414-043e-45f2-88a2-f77a5c9df60c" />

Graph with this PR:
<img width="1248" height="474" alt="image" src="https://github.com/user-attachments/assets/e0e13794-b17b-4337-8768-f0191cb1c0e6" />

r? @JonathanBrouwer

Author: JonathanBrouwer

Cargo.lock

@@ -3664,7 +3664,7 @@ dependencies = [
  "rustc_macros",
  "rustc_serialize",
  "rustc_span",
- "rustc_target",
+ "rustc_structures",
  "smallvec",
  "thin-vec",
  "tracing",
@@ -3688,6 +3688,7 @@ dependencies = [
  "rustc_parse_format",
  "rustc_session",
  "rustc_span",
+ "rustc_structures",
  "rustc_target",
  "thin-vec",
 ]
@@ -3785,6 +3786,7 @@ dependencies = [
  "rustc_sanitizers",
  "rustc_session",
  "rustc_span",
+ "rustc_structures",
  "rustc_symbol_mangling",
  "rustc_target",
  "smallvec",
@@ -3824,6 +3826,7 @@ dependencies = [
  "rustc_serialize",
  "rustc_session",
  "rustc_span",
+ "rustc_structures",
  "rustc_symbol_mangling",
  "rustc_target",
  "rustc_trait_selection",
@@ -3855,6 +3858,7 @@ dependencies = [
  "rustc_mir_dataflow",
  "rustc_session",
  "rustc_span",
+ "rustc_structures",
  "rustc_target",
  "rustc_trait_selection",
  "tracing",
@@ -3871,6 +3875,7 @@ dependencies = [
  "rustc_macros",
  "rustc_serialize",
  "rustc_span",
+ "rustc_structures",
 ]
 
 [[package]]
@@ -3949,6 +3954,7 @@ dependencies = [
  "rustc_resolve",
  "rustc_session",
  "rustc_span",
+ "rustc_structures",
  "rustc_target",
  "serde_json",
  "shlex",
@@ -4023,6 +4029,7 @@ dependencies = [
  "rustc_serialize",
  "rustc_session",
  "rustc_span",
+ "rustc_structures",
  "scoped-tls",
  "smallvec",
  "thin-vec",
@@ -4098,6 +4105,7 @@ dependencies = [
  "rustc_middle",
  "rustc_session",
  "rustc_span",
+ "rustc_structures",
  "rustc_target",
  "rustc_trait_selection",
  "smallvec",
@@ -4251,6 +4259,7 @@ dependencies = [
  "rustc_resolve",
  "rustc_session",
  "rustc_span",
+ "rustc_structures",
  "rustc_symbol_mangling",
  "rustc_target",
  "rustc_thread_pool",
@@ -4292,6 +4301,7 @@ dependencies = [
  "rustc_parse_format",
  "rustc_session",
  "rustc_span",
+ "rustc_structures",
  "rustc_symbol_mangling",
  "rustc_target",
  "rustc_trait_selection",
@@ -4373,6 +4383,7 @@ dependencies = [
  "rustc_serialize",
  "rustc_session",
  "rustc_span",
+ "rustc_structures",
  "rustc_target",
  "tempfile",
  "tracing",
@@ -4405,6 +4416,7 @@ dependencies = [
  "rustc_serialize",
  "rustc_session",
  "rustc_span",
+ "rustc_structures",
  "rustc_target",
  "rustc_thread_pool",
  "rustc_type_ir",
@@ -4476,6 +4488,7 @@ dependencies = [
  "rustc_mir_dataflow",
  "rustc_session",
  "rustc_span",
+ "rustc_structures",
  "rustc_target",
  "rustc_trait_selection",
  "smallvec",
@@ -4498,6 +4511,7 @@ dependencies = [
  "rustc_serialize",
  "rustc_session",
  "rustc_span",
+ "rustc_structures",
  "rustc_symbol_mangling",
  "rustc_target",
  "serde",
@@ -4571,6 +4585,7 @@ dependencies = [
  "rustc_privacy",
  "rustc_session",
  "rustc_span",
+ "rustc_structures",
  "rustc_target",
  "rustc_trait_selection",
  "tracing",
@@ -4663,6 +4678,7 @@ dependencies = [
  "rustc_middle",
  "rustc_serialize",
  "rustc_span",
+ "rustc_structures",
  "rustc_thread_pool",
  "tracing",
 ]
@@ -4690,6 +4706,7 @@ dependencies = [
  "rustc_middle",
  "rustc_session",
  "rustc_span",
+ "rustc_structures",
  "smallvec",
  "thin-vec",
  "tracing",
@@ -4731,7 +4748,6 @@ dependencies = [
  "libc",
  "rustc_abi",
  "rustc_ast",
- "rustc_attr_ir",
  "rustc_data_structures",
  "rustc_errors",
  "rustc_feature",
@@ -4741,6 +4757,7 @@ dependencies = [
  "rustc_macros",
  "rustc_serialize",
  "rustc_span",
+ "rustc_structures",
  "rustc_target",
  "termize",
  "tracing",
@@ -4770,6 +4787,20 @@ dependencies = [
  "unicode-width 0.2.2",
 ]
 
+[[package]]
+name = "rustc_structures"
+version = "0.0.0"
+dependencies = [
+ "bitflags",
+ "rustc_data_structures",
+ "rustc_error_messages",
+ "rustc_macros",
+ "rustc_serialize",
+ "rustc_span",
+ "schemars",
+ "serde",
+]
+
 [[package]]
 name = "rustc_symbol_mangling"
 version = "0.0.0"
@@ -4800,6 +4831,7 @@ dependencies = [
  "rustc_macros",
  "rustc_serialize",
  "rustc_span",
+ "rustc_structures",
  "schemars",
  "serde",
  "serde_derive",
@@ -4849,6 +4881,7 @@ dependencies = [
  "rustc_next_trait_solver",
  "rustc_session",
  "rustc_span",
+ "rustc_structures",
  "rustc_transmute",
  "smallvec",
  "thin-vec",
@@ -4897,6 +4930,7 @@ dependencies = [
  "rustc_middle",
  "rustc_session",
  "rustc_span",
+ "rustc_structures",
  "rustc_target",
  "rustc_trait_selection",
  "rustc_ty_walk",

compiler/rustc_attr_ir/Cargo.toml

@@ -13,7 +13,7 @@ rustc_error_messages = { path = "../rustc_error_messages" }
 rustc_macros = { path = "../rustc_macros" }
 rustc_serialize = { path = "../rustc_serialize" }
 rustc_span = { path = "../rustc_span" }
-rustc_target = { path = "../rustc_target" }
+rustc_structures = { path = "../rustc_structures" }
 smallvec = { version = "1.8.1", features = ["union", "may_dangle"] }
 thin-vec = "0.2.18"
 tracing = "0.1"