Auto merge of #72357 - ortem:new-dbg-pretty-printers, r=pnkfelix

Implement new gdb/lldb pretty-printers

Reopened #60826

This PR replaces current gdb and lldb pretty-printers with new ones that were originally written for [IntelliJ Rust](https://github.com/intellij-rust/intellij-rust/tree/master/prettyPrinters).

The current state of lldb pretty-printers is poor, because [they don't use synthetic children](#55586 (comment)). When I started to reimplement lldb pretty-printers with synthetic children support, I've found current version strange and hard to support. I think `debugger_pretty_printers_common.py` is overkill, so I got rid of it.

The new pretty-printers have to support all types supported by current pretty-printers, and also support `Rc`, `Arc`, `Cell`, `Ref`, `RefCell`, `RefMut`, `HashMap`, `HashSet`.

Fixes #56252

src/bootstrap/dist.rs

@@ -619,19 +619,21 @@ impl Step for DebuggerScripts {
             cp_debugger_script("natvis/libcore.natvis");
             cp_debugger_script("natvis/libstd.natvis");
         } else {
-            cp_debugger_script("debugger_pretty_printers_common.py");
+            cp_debugger_script("rust_types.py");
 
             // gdb debugger scripts
             builder.install(&builder.src.join("src/etc/rust-gdb"), &sysroot.join("bin"), 0o755);
             builder.install(&builder.src.join("src/etc/rust-gdbgui"), &sysroot.join("bin"), 0o755);
 
             cp_debugger_script("gdb_load_rust_pretty_printers.py");
-            cp_debugger_script("gdb_rust_pretty_printing.py");
+            cp_debugger_script("gdb_lookup.py");
+            cp_debugger_script("gdb_providers.py");
 
             // lldb debugger scripts
             builder.install(&builder.src.join("src/etc/rust-lldb"), &sysroot.join("bin"), 0o755);
 
-            cp_debugger_script("lldb_rust_formatters.py");
+            cp_debugger_script("lldb_lookup.py");
+            cp_debugger_script("lldb_providers.py");
         }
     }
 }