Always build and ship parallel-enabled compilers

This also removes the unused NO_PARALLEL_COMPILER flag; if we want that
functionality we can readd it but this makes sure we really are parallel
everywhere.

This also patches a test that has differing output in the parallel case
(hopefully deterministically so!).

Author: Mark-Simulacrum

src/ci/run.sh

@@ -37,6 +37,8 @@ if [ "$DIST_SRC" = "" ]; then
   RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --disable-dist-src"
 fi
 
+RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --set rust.parallel-compiler"
+
 # If we're deploying artifacts then we set the release channel, otherwise if
 # we're not deploying then we want to be sure to enable all assertions because
 # we'll be running tests
@@ -53,9 +55,6 @@ if [ "$DEPLOY$DEPLOY_ALT" = "1" ]; then
   if [ "$NO_LLVM_ASSERTIONS" = "1" ]; then
     RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --disable-llvm-assertions"
   elif [ "$DEPLOY_ALT" != "" ]; then
-    if [ "$NO_PARALLEL_COMPILER" = "" ]; then
-      RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --set rust.parallel-compiler"
-    fi
     RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --enable-llvm-assertions"
     RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --set rust.verify-llvm-ir"
   fi

src/test/ui/traits/cycle-cache-err-60010.rs

@@ -28,7 +28,7 @@ struct SalsaStorage {
 }
 
 impl Database for RootDatabase {
-    type Storage = SalsaStorage; //~ ERROR overflow
+    type Storage = SalsaStorage;
 }
 impl HasQueryGroup for RootDatabase {}
 impl<DB> Query<DB> for ParseQuery

src/test/ui/traits/cycle-cache-err-60010.stderr

@@ -6,22 +6,6 @@ LL |     _parse: <ParseQuery as Query<RootDatabase>>::Data,
    |
    = note: required because of the requirements on the impl of `Query<RootDatabase>` for `ParseQuery`
 
-error[E0275]: overflow evaluating the requirement `Runtime<RootDatabase>: std::panic::RefUnwindSafe`
-  --> $DIR/cycle-cache-err-60010.rs:31:5
-   |
-LL |     type Storage;
-   |          ------- associated type defined here
-...
-LL | impl Database for RootDatabase {
-   | ------------------------------ in this `impl` item
-LL |     type Storage = SalsaStorage;
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: required because it appears within the type `RootDatabase`
-   = note: required because of the requirements on the impl of `SourceDatabase` for `RootDatabase`
-   = note: required because of the requirements on the impl of `Query<RootDatabase>` for `ParseQuery`
-   = note: required because it appears within the type `SalsaStorage`
-
-error: aborting due to 2 previous errors
+error: aborting due to previous error
 
 For more information about this error, try `rustc --explain E0275`.