Auto merge of #51334 - Mark-Simulacrum:rollup, r=Mark-Simulacrum

Rollup of 6 pull requests

Successful merges:

 - #51288 (Remove rustdoc-specific is_import field from HIR)
 - #51299 (const fn integer operations)
 - #51317 (Allow enabling incremental via config.toml)
 - #51323 (Generate br for all two target SwitchInts)
 - #51326 (Various minor slice iterator cleanups)
 - #51329 (Remove the unused `-Z trans-time-graph` flag.)

Failed merges:

config.toml.example

@@ -279,6 +279,9 @@
 # Whether or not `panic!`s generate backtraces (RUST_BACKTRACE)
 #backtrace = true
 
+# Whether to always use incremental compilation when building rustc
+#incremental = false
+
 # Build rustc with experimental parallelization
 #experimental-parallel-queries = false
 

src/bootstrap/config.rs

@@ -303,6 +303,7 @@ struct Rust {
     dist_src: Option<bool>,
     quiet_tests: Option<bool>,
     test_miri: Option<bool>,
+    incremental: Option<bool>,
     save_toolstates: Option<String>,
     codegen_backends: Option<Vec<String>>,
     codegen_backends_dir: Option<String>,
@@ -529,6 +530,10 @@ impl Config {
             set(&mut config.rust_dist_src, rust.dist_src);
             set(&mut config.quiet_tests, rust.quiet_tests);
             set(&mut config.test_miri, rust.test_miri);
+            // in the case "false" is set explicitly, do not overwrite the command line args
+            if let Some(true) = rust.incremental {
+                config.incremental = true;
+            }
             set(&mut config.wasm_syscall, rust.wasm_syscall);
             set(&mut config.lld_enabled, rust.lld);
             config.rustc_parallel_queries = rust.experimental_parallel_queries.unwrap_or(false);

src/libcore/lib.rs

@@ -81,6 +81,7 @@
 #![feature(cfg_target_has_atomic)]
 #![feature(concat_idents)]
 #![feature(const_fn)]
+#![feature(const_int_ops)]
 #![feature(core_float)]
 #![feature(custom_attribute)]
 #![feature(doc_cfg)]