[TEST] Enable the parallel compiler with 8 threads

[Zoxc]

This is just a test to see if CI runs into any issues.

[rustbot]

r? @cjgillot

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[rust-log-analyzer]

The job x86_64-gnu-llvm-15 failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)

---- [ui] tests/ui/consts/const_in_pattern/issue-73431.rs stdout ----
diff of stderr:

- WARN rustc_mir_build::thir::pattern::const_to_pat MIR const-checker found novel structural match violation. See #73448.
+ 2:rustcWARN rustc_mir_build::thir::pattern::const_to_pat MIR const-checker found novel structural match violation. See #73448.


The actual stderr differed from the expected stderr.
Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/consts/const_in_pattern/issue-73431/issue-73431.stderr
Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/consts/const_in_pattern/issue-73431/issue-73431.stderr
To update references, rerun the tests and pass the `--bless` flag
To only update this specific test, also pass `--test-args consts/const_in_pattern/issue-73431.rs`

error: 1 errors occurred comparing output.
status: exit status: 0
command: RUSTC_ICE="0" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/consts/const_in_pattern/issue-73431.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "--target=x86_64-unknown-linux-gnu" "-O" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "-C" "prefer-dynamic" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/consts/const_in_pattern/issue-73431/a" "-A" "internal_features" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/consts/const_in_pattern/issue-73431/auxiliary"
--- stderr -------------------------------
--- stderr -------------------------------
2:rustcWARN rustc_mir_build::thir::pattern::const_to_pat MIR const-checker found novel structural match violation. See #73448.



failures:

[apiraino]

Reassigning to author to investigate CI run and removing review assignee (I think this PR is meant to be assigned to the author).

@rustbot author

r? ghost

[rustbot]

Failed to set assignee to ghost: invalid assignee

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