Move finalize_session_directory call out of cg_llvm

This causes it to be called even when passing `-Zno-link`, when linking
fails or when neither `--emit link` nor `--emit metadata` is used.

Author: bjorn3

Diff for: compiler/rustc_codegen_llvm/src/lib.rs

@@ -325,10 +325,6 @@ impl CodegenBackend for LlvmCodegenBackend {
             );
         });
 
-        // Now that we won't touch anything in the incremental compilation directory
-        // any more, we can finalize it (which involves renaming it)
-        rustc_incremental::finalize_session_directory(sess, codegen_results.crate_hash);
-
         sess.time("llvm_dump_timing_file", || {
             if sess.opts.debugging_opts.llvm_time_trace {
                 llvm_util::time_trace_profiler_finish("llvm_timings.json");

Diff for: compiler/rustc_codegen_ssa/src/back/write.rs

@@ -13,7 +13,6 @@ use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::profiling::SelfProfilerRef;
 use rustc_data_structures::profiling::TimingGuard;
 use rustc_data_structures::profiling::VerboseTimingGuard;
-use rustc_data_structures::svh::Svh;
 use rustc_data_structures::sync::Lrc;
 use rustc_errors::emitter::Emitter;
 use rustc_errors::{DiagnosticId, FatalError, Handler, Level};
@@ -414,7 +413,6 @@ pub fn start_async_codegen<B: ExtraBackendMethods>(
     let sess = tcx.sess;
 
     let crate_name = tcx.crate_name(LOCAL_CRATE);
-    let crate_hash = tcx.crate_hash(LOCAL_CRATE);
     let no_builtins = tcx.sess.contains_name(&tcx.hir().krate().item.attrs, sym::no_builtins);
     let is_compiler_builtins =
         tcx.sess.contains_name(&tcx.hir().krate().item.attrs, sym::compiler_builtins);
@@ -463,7 +461,6 @@ pub fn start_async_codegen<B: ExtraBackendMethods>(
     OngoingCodegen {
         backend,
         crate_name,
-        crate_hash,
         metadata,
         windows_subsystem,
         linker_info,
@@ -1720,7 +1717,6 @@ impl SharedEmitterMain {
 pub struct OngoingCodegen<B: ExtraBackendMethods> {
     pub backend: B,
     pub crate_name: Symbol,
-    pub crate_hash: Svh,
     pub metadata: EncodedMetadata,
     pub windows_subsystem: Option<String>,
     pub linker_info: LinkerInfo,
@@ -1766,7 +1762,6 @@ impl<B: ExtraBackendMethods> OngoingCodegen<B> {
         (
             CodegenResults {
                 crate_name: self.crate_name,
-                crate_hash: self.crate_hash,
                 metadata: self.metadata,
                 windows_subsystem: self.windows_subsystem,
                 linker_info: self.linker_info,

Diff for: compiler/rustc_codegen_ssa/src/lib.rs

@@ -21,7 +21,6 @@ extern crate tracing;
 extern crate rustc_middle;
 
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
-use rustc_data_structures::svh::Svh;
 use rustc_data_structures::sync::Lrc;
 use rustc_hir::def_id::CrateNum;
 use rustc_hir::LangItem;
@@ -134,7 +133,6 @@ pub struct CodegenResults {
     pub modules: Vec<CompiledModule>,
     pub allocator_module: Option<CompiledModule>,
     pub metadata_module: Option<CompiledModule>,
-    pub crate_hash: Svh,
     pub metadata: rustc_middle::middle::cstore::EncodedMetadata,
     pub windows_subsystem: Option<String>,
     pub linker_info: back::linker::LinkerInfo,

Diff for: compiler/rustc_interface/src/queries.rs

@@ -3,6 +3,7 @@ use crate::passes::{self, BoxedResolver, QueryContext};
 
 use rustc_ast as ast;
 use rustc_codegen_ssa::traits::CodegenBackend;
+use rustc_data_structures::svh::Svh;
 use rustc_data_structures::sync::{Lrc, OnceCell, WorkerLocal};
 use rustc_errors::ErrorReported;
 use rustc_hir::def_id::LOCAL_CRATE;
@@ -331,6 +332,7 @@ impl<'tcx> Queries<'tcx> {
     pub fn linker(&'tcx self) -> Result<Linker> {
         let dep_graph = self.dep_graph()?;
         let prepare_outputs = self.prepare_outputs()?;
+        let crate_hash = self.global_ctxt()?.peek_mut().enter(|tcx| tcx.crate_hash(LOCAL_CRATE));
         let ongoing_codegen = self.ongoing_codegen()?;
 
         let sess = self.session().clone();
@@ -340,6 +342,7 @@ impl<'tcx> Queries<'tcx> {
             sess,
             dep_graph: dep_graph.peek().clone(),
             prepare_outputs: prepare_outputs.take(),
+            crate_hash,
             ongoing_codegen: ongoing_codegen.take(),
             codegen_backend,
         })
@@ -350,6 +353,7 @@ pub struct Linker {
     sess: Lrc<Session>,
     dep_graph: DepGraph,
     prepare_outputs: OutputFilenames,
+    crate_hash: Svh,
     ongoing_codegen: Box<dyn Any>,
     codegen_backend: Lrc<Box<dyn CodegenBackend>>,
 }
@@ -370,6 +374,10 @@ impl Linker {
         let prof = self.sess.prof.clone();
         prof.generic_activity("drop_dep_graph").run(move || drop(dep_graph));
 
+        // Now that we won't touch anything in the incremental compilation directory
+        // any more, we can finalize it (which involves renaming it)
+        rustc_incremental::finalize_session_directory(&self.sess, self.crate_hash);
+
         if !self
             .sess
             .opts