Rename consuming chaining methods on DiagnosticBuilder.

In #119606 I added them and used a `_mv` suffix, but that wasn't great.

A `with_` prefix has three different existing uses.
- Constructors, e.g. `Vec::with_capacity`.
- Wrappers that provide an environment to execute some code, e.g.
  `with_session_globals`.
- Consuming chaining methods, e.g. `Span::with_{lo,hi,ctxt}`.

The third case is exactly what we want, so this commit changes
`DiagnosticBuilder::foo_mv` to `DiagnosticBuilder::with_foo`.

Thanks to @compiler-errors for the suggestion.

compiler/rustc_codegen_llvm/src/errors.rs

@@ -106,7 +106,7 @@ impl<G: EmissionGuarantee> IntoDiagnostic<'_, G> for ParseTargetMachineConfig<'_
         let message = dcx.eagerly_translate_to_string(message.clone(), diag.args());
 
         DiagnosticBuilder::new(dcx, level, fluent::codegen_llvm_parse_target_machine_config)
-            .arg_mv("error", message)
+            .with_arg("error", message)
     }
 }
 
@@ -204,8 +204,8 @@ impl<G: EmissionGuarantee> IntoDiagnostic<'_, G> for WithLlvmError<'_> {
         };
         self.0
             .into_diagnostic(dcx, level)
-            .primary_message_mv(msg_with_llvm_err)
-            .arg_mv("llvm_err", self.1)
+            .with_primary_message(msg_with_llvm_err)
+            .with_arg("llvm_err", self.1)
     }
 }