Rollup merge of #98564 - jyn514:remove-tmp-dir, r=Mark-Simulacrum

Remove references to `./tmp` in-tree

These used to be used by codegen-units tests, but were switched from manually specifying directories
to just using `// incremental` in https://github.com/rust-lang/rust/pull/89101.
Remove the old references.

Fixes https://github.com/rust-lang/rust/issues/34586.

.gitignore

@@ -46,8 +46,6 @@ no_llvm_build
 /unicode-downloads
 /target
 /src/tools/x/target
-# Generated by compiletest for incremental
-/tmp/
 # Created by default with `src/ci/docker/run.sh`
 /obj/
 

src/tools/compiletest/src/main.rs

@@ -351,11 +351,6 @@ pub fn opt_str2(maybestr: Option<String>) -> String {
 }
 
 pub fn run_tests(config: Config) {
-    // FIXME(#33435) Avoid spurious failures in codegen-units/partitioning tests.
-    if let Mode::CodegenUnits = config.mode {
-        let _ = fs::remove_dir_all("tmp/partitioning-tests");
-    }
-
     // If we want to collect rustfix coverage information,
     // we first make sure that the coverage file does not exist.
     // It will be created later on.