Update two failing incremental tests for the new behavior

On the nopt builders, we disable optimization by default for all tests
which causes the new behavior to take effect and causes the tests to
fail when they should not. By passing the `-O` flag explicitly, we will
always run these tests with optimizations enabled.

1 files changed, 7 insertions, 2 deletions

diff --git a/src/test/incremental/hygiene/load_cached_hygiene.rs b/src/test/incremental/hygiene/load_cached_hygiene.rs
index 8124141418b..d6a5cb993a4 100644
--- a/src/test/incremental/hygiene/load_cached_hygiene.rs
+++ b/src/test/incremental/hygiene/load_cached_hygiene.rs
@@ -1,5 +1,5 @@
 // revisions:rpass1 rpass2
-// compile-flags: -Z query-dep-graph
+// compile-flags: -Z query-dep-graph -O
 // aux-build:cached_hygiene.rs
 
 // This tests the folllowing scenario
@@ -19,7 +19,12 @@
 // the metadata. Specifically, we were not resetting `orig_id`
 // for an `EpxnData` generate in the current crate, which would cause
 // us to serialize the `ExpnId` pointing to a garbage location in
-// the metadata.
+// the metadata.o
+
+// NOTE: We're explicitly passing the `-O` optimization flag because if optimizations are not
+// enabled, then rustc will ignore the `#[inline(always)]` attribute which means we do not load
+// the optimized mir for the unmodified function to be loaded and so the CGU containing that
+// function will be reused.
 
 #![feature(rustc_attrs)]