Merge from rustc

2 files changed, 5 insertions, 0 deletions

diff --git a/compiler/rustc_data_structures/src/stack.rs b/compiler/rustc_data_structures/src/stack.rs
index 7ff1339c5ab..3d6d0003483 100644
--- a/compiler/rustc_data_structures/src/stack.rs
+++ b/compiler/rustc_data_structures/src/stack.rs
@@ -5,7 +5,11 @@ const RED_ZONE: usize = 100 * 1024; // 100k
 
 // Only the first stack that is pushed, grows exponentially (2^n * STACK_PER_RECURSION) from then
 // on. This flag has performance relevant characteristics. Don't set it too high.
+#[cfg(not(target_os = "aix"))]
 const STACK_PER_RECURSION: usize = 1024 * 1024; // 1MB
+// LLVM for AIX doesn't feature TCO, increase recursion size for workaround.
+#[cfg(target_os = "aix")]
+const STACK_PER_RECURSION: usize = 16 * 1024 * 1024; // 16MB
 
 /// Grows the stack on demand to prevent stack overflow. Call this in strategic locations
 /// to "break up" recursive calls. E.g. almost any call to `visit_expr` or equivalent can benefit
diff --git a/compiler/rustc_data_structures/src/unhash.rs b/compiler/rustc_data_structures/src/unhash.rs
index 48e21a9dab1..0617ef83aad 100644
--- a/compiler/rustc_data_structures/src/unhash.rs
+++ b/compiler/rustc_data_structures/src/unhash.rs
@@ -3,6 +3,7 @@ use std::hash::{BuildHasherDefault, Hasher};
 
 pub type UnhashMap<K, V> = HashMap<K, V, BuildHasherDefault<Unhasher>>;
 pub type UnhashSet<V> = HashSet<V, BuildHasherDefault<Unhasher>>;
+pub type UnindexMap<K, V> = indexmap::IndexMap<K, V, BuildHasherDefault<Unhasher>>;
 
 /// This no-op hasher expects only a single `write_u64` call. It's intended for
 /// map keys that already have hash-like quality, like `Fingerprint`.