Auto merge of #54764 - tromey:test-rust-lldb, r=alexcrichton

Run debuginfo tests against rust-enabled lldb, when possible

If the rust-enabled lldb was built, then use it when running the
debuginfo tests.  Updating the lldb submodule was necessary as this
needed a way to differentiate the rust-enabled lldb, so I added a line
to the --version output.

This adds compiletest commands to differentiate between the
rust-enabled and non-rust-enabled lldb, as is already done for gdb.  A
new "rust-lldb" header directive is also added, but not used in this
patch; I plan to use it in #54004.

This updates all the tests.

Author: bors

src/bootstrap/lib.rs

@@ -278,10 +278,6 @@ pub struct Build {
     initial_rustc: PathBuf,
     initial_cargo: PathBuf,
 
-    // Probed tools at runtime
-    lldb_version: Option<String>,
-    lldb_python_dir: Option<String>,
-
     // Runtime state filled in later on
     // C/C++ compilers and archiver for all targets
     cc: HashMap<Interned<String>, cc::Tool>,
@@ -416,8 +412,6 @@ impl Build {
             ar: HashMap::new(),
             ranlib: HashMap::new(),
             crates: HashMap::new(),
-            lldb_version: None,
-            lldb_python_dir: None,
             is_sudo,
             ci_env: CiEnv::current(),
             delayed_failures: RefCell::new(Vec::new()),

src/bootstrap/sanity.rs

@@ -236,19 +236,6 @@ $ pacman -R cmake && pacman -S mingw-w64-x86_64-cmake
         }
     }
 
-    let run = |cmd: &mut Command| {
-        cmd.output().map(|output| {
-            String::from_utf8_lossy(&output.stdout)
-                   .lines().next().unwrap_or_else(|| {
-                       panic!("{:?} failed {:?}", cmd, output)
-                   }).to_string()
-        })
-    };
-    build.lldb_version = run(Command::new("lldb").arg("--version")).ok();
-    if build.lldb_version.is_some() {
-        build.lldb_python_dir = run(Command::new("lldb").arg("-P")).ok();
-    }
-
     if let Some(ref s) = build.config.ccache {
         cmd_finder.must_have(s);
     }