Support -C passes in NewPM

And report an error if parsing the additional pass pipeline fails.
Threading through the error accounts for most of the changes here.

2 files changed, 2 insertions, 2 deletions

diff --git a/compiler/rustc_codegen_ssa/src/back/lto.rs b/compiler/rustc_codegen_ssa/src/back/lto.rs
index 0ff05229466..d6ae689f254 100644
--- a/compiler/rustc_codegen_ssa/src/back/lto.rs
+++ b/compiler/rustc_codegen_ssa/src/back/lto.rs
@@ -72,7 +72,7 @@ impl<B: WriteBackendMethods> LtoModuleCodegen<B> {
                 let module = module.take().unwrap();
                 {
                     let config = cgcx.config(module.kind);
-                    B::run_lto_pass_manager(cgcx, &module, config, false);
+                    B::run_lto_pass_manager(cgcx, &module, config, false)?;
                 }
                 Ok(module)
             }
diff --git a/compiler/rustc_codegen_ssa/src/traits/write.rs b/compiler/rustc_codegen_ssa/src/traits/write.rs
index 264e7c2aa92..93fbee2b49b 100644
--- a/compiler/rustc_codegen_ssa/src/traits/write.rs
+++ b/compiler/rustc_codegen_ssa/src/traits/write.rs
@@ -58,7 +58,7 @@ pub trait WriteBackendMethods: 'static + Sized + Clone {
         llmod: &ModuleCodegen<Self::Module>,
         config: &ModuleConfig,
         thin: bool,
-    );
+    ) -> Result<(), FatalError>;
 }
 
 pub trait ThinBufferMethods: Send + Sync {