Merge pull request #2874 from uweigand/s390x-backend

Support IBM z/Architecture

cranelift/codegen/src/isa/mod.rs

@@ -90,6 +90,9 @@ mod arm32;
 #[cfg(feature = "arm64")]
 pub(crate) mod aarch64;
 
+#[cfg(feature = "s390x")]
+mod s390x;
+
 pub mod unwind;
 
 mod call_conv;
@@ -159,6 +162,7 @@ pub fn lookup_variant(triple: Triple, variant: BackendVariant) -> Result<Builder
         }
         (Architecture::Arm { .. }, _) => isa_builder!(arm32, (feature = "arm32"), triple),
         (Architecture::Aarch64 { .. }, _) => isa_builder!(aarch64, (feature = "arm64"), triple),
+        (Architecture::S390x { .. }, _) => isa_builder!(s390x, (feature = "s390x"), triple),
         _ => Err(LookupError::Unsupported),
     }
 }