Rollup merge of #136865 - jieyouxu:long-type-path-compare-mode, r=lqd

Perform deeper compiletest path normalization for `$TEST_BUILD_DIR` to account for compare-mode/debugger cases, and normalize long type file filename hashes

Fixes #136510.

### Summary

- Whereas previously `$TEST_BUILD_DIR` is a normalization of `/path/to/build/test/<test_suite_name>/`, we now more deeply normalize. `$TEST_BUILD_DIR` now becomes a normalization of `/path/to/build/test/<test_suite_name>/<subdirs>/$name.$revision.$compare_mode.$debugger/` to normalize away path name differences when `--compare-mode` and/or `--debugger` are specified.
- We also centralize the normalization of long type name hashes

cf. #136328 (comment).

### Review advice

- Best reviewed commit-by-commit.
- Split into 3 commits:
    - **Commit 1**: compiletest changes to have `$TEST_BUILD_DIR` more deeply normalize.
    - **Commit 2**: remove per-test hacks for long type path hash normalizations, and rebless tests *specifically* affected by that.
    - **Commit 3**: rebless other tests that were changed as a side-effect of deeper `$TEST_BUILD_DIR` normalizations.

**Commit 2** is created via first finding tests that try to perform long type file hash normalizations on an ad hoc, per-test basis:

```
rg --no-ignore -l --no-ignore -F -e "long-type" tests/ui/**/*.rs
```

<details>
<summary>Tests with ad hoc long-type hash normalizations</summary>

```
tests/ui/type_length_limit.rs
tests/ui/traits/on_unimplemented_long_types.rs
tests/ui/regions/issue-102374.rs
tests/ui/recursion/recursion.rs
tests/ui/recursion/issue-83150.rs
tests/ui/recursion/issue-23122-2.rs
tests/ui/methods/inherent-bound-in-probe.rs
tests/ui/issues/issue-67552.rs
tests/ui/issues/issue-37311-type-length-limit/issue-37311.rs
tests/ui/issues/issue-20413.rs
tests/ui/issues/issue-8727.rs
tests/ui/infinite/infinite-instantiation.rs
tests/ui/infinite/infinite-instantiation-struct-tail-ice-114484.rs
tests/ui/higher-ranked/trait-bounds/hrtb-doesnt-borrow-self-1.rs
tests/ui/higher-ranked/trait-bounds/hrtb-doesnt-borrow-self-2.rs
tests/ui/higher-ranked/trait-bounds/hang-on-deeply-nested-dyn.rs
tests/ui/error-codes/E0275.rs
tests/ui/diagnostic-width/secondary-label-with-long-type.rs
tests/ui/diagnostic-width/long-e0277.rs
tests/ui/diagnostic-width/non-copy-type-moved.rs
tests/ui/diagnostic-width/long-E0308.rs
tests/ui/diagnostic-width/E0271.rs
tests/ui/diagnostic-width/binop.rs
```
</details>

These ad hoc normalizations were removed, and they are reblessed.

r? `````@lqd`````

Author: jieyouxu

src/tools/compiletest/src/runtest.rs

@@ -2412,8 +2412,9 @@ impl<'test> TestCx<'test> {
         let rust_src_dir = rust_src_dir.read_link().unwrap_or(rust_src_dir.to_path_buf());
         normalize_path(&rust_src_dir.join("library"), "$SRC_DIR_REAL");
 
-        // eg. /home/user/rust/build/x86_64-unknown-linux-gnu/test/ui
-        normalize_path(&self.config.build_test_suite_root, "$TEST_BUILD_DIR");
+        // eg.
+        // /home/user/rust/build/x86_64-unknown-linux-gnu/test/ui/<test_dir>/$name.$revision.$mode/
+        normalize_path(&self.output_base_dir(), "$TEST_BUILD_DIR");
         // eg. /home/user/rust/build
         normalize_path(&self.config.build_root, "$BUILD_DIR");
 
@@ -2434,6 +2435,18 @@ impl<'test> TestCx<'test> {
             .into_owned();
 
         normalized = Self::normalize_platform_differences(&normalized);
+
+        // Normalize long type name hash.
+        normalized =
+            static_regex!(r"\$TEST_BUILD_DIR/(?P<filename>[^\.]+).long-type-(?P<hash>\d+).txt")
+                .replace_all(&normalized, |caps: &Captures<'_>| {
+                    format!(
+                        "$TEST_BUILD_DIR/{filename}.long-type-$LONG_TYPE_HASH.txt",
+                        filename = &caps["filename"]
+                    )
+                })
+                .into_owned();
+
         normalized = normalized.replace("\t", "\\t"); // makes tabs visible
 
         // Remove test annotations like `//~ ERROR text` from the output,

tests/ui-fulldeps/codegen-backend/hotplug.bindep.stdout

@@ -1,4 +1,4 @@
-$TEST_BUILD_DIR/codegen-backend/hotplug.bindep/libhotplug.rlib: $DIR/hotplug.rs $TEST_BUILD_DIR/codegen-backend/hotplug.bindep/auxiliary/libthe_backend.so
+$TEST_BUILD_DIR/libhotplug.rlib: $DIR/hotplug.rs $TEST_BUILD_DIR/auxiliary/libthe_backend.so
 
 $DIR/hotplug.rs:
-$TEST_BUILD_DIR/codegen-backend/hotplug.bindep/auxiliary/libthe_backend.so:
+$TEST_BUILD_DIR/auxiliary/libthe_backend.so: