autodiff: Extend typetree generation to cover extractvalue.

[ZuseZ4]

Further typetree improvements after #158333, to generate type information for the extractvalue builder.
I factored out this uncontroversial change from #158440, since the memcpy handling there will need more work.

[ZuseZ4]

TODO: cleanup

View changes since the review

[rust-log-analyzer]

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##[endgroup]
[TIMING:end] tool::ToolBuild { build_compiler: Compiler { stage: 0, host: x86_64-unknown-linux-gnu, forced_compiler: false }, target: x86_64-unknown-linux-gnu, tool: "tidy", path: "src/tools/tidy", mode: ToolBootstrap, source_type: InTree, extra_features: [], allow_features: "", cargo_args: [], artifact_kind: Binary } -- 10.794
[TIMING:end] tool::Tidy { compiler: Compiler { stage: 0, host: x86_64-unknown-linux-gnu, forced_compiler: false }, target: x86_64-unknown-linux-gnu } -- 0.000
fmt check
Diff in /checkout/compiler/rustc_codegen_ssa/src/mir/operand.rs:19:
 use super::place::{PlaceRef, PlaceValue};
 use super::rvalue::transmute_scalar;
 use super::{FunctionCx, LocalRef};
+use crate::MemFlags;
 use crate::common::IntPredicate;
 use crate::traits::*;
-use crate::MemFlags;
 
 /// The representation of a Rust value. The enum variant is in fact
 /// uniquely determined by the value's type, but is kept as a
Diff in /checkout/compiler/rustc_middle/src/ty/typetree.rs:1:
 use rustc_ast::expand::typetree::{FncTree, Kind, Type, TypeTree};
-use tracing::trace;
 use rustc_hir::LangItem;
 use rustc_span::sym;
+use tracing::trace;
 
---
 
 /// Generate a TypeTree for a specific type.
 /// Mainly a convenience wrapper around the actual implementation.
Diff in /checkout/compiler/rustc_codegen_llvm/src/builder.rs:1268:
             unsafe { llvm::LLVMBuildExtractValue(self.llbuilder, agg_val, idx as c_uint, UNNAMED) };
         if let Some(tt) = tt {
             let fnc_tree = FncTree { args: vec![], ret: tt };
-            crate::typetree::add_tt(
-                self,
-                extract,
-                fnc_tree,
-            );
+            crate::typetree::add_tt(self, extract, fnc_tree);
         }
         extract
     }
fmt: checked 6997 files
Bootstrap failed while executing `test src/tools/tidy tidyselftest --extra-checks=py,cpp,js,spellcheck`