[llvm] [llvm-objcopy] Check for missing argument values (PR #70710)

[via llvm-commits]

================
@@ -0,0 +1,4 @@
+## An error must be reported if a required argument value is missing.
+# RUN: not llvm-objcopy --only-section 2>&1 | FileCheck --check-prefix=CHECK-NO-VALUE %s
----------------
quic-akaryaki wrote:

Sorry it was too strong. It is certainly possibly to add new check prefixes without rewriting the default one, but then the default one would stand out awkwardly, in my opinion. 

https://github.com/llvm/llvm-project/pull/70710