[llvm-readobj] Change -long-option to --long-option in tests. NFC

We use both -long-option and --long-option in tests. Switch to --long-option for consistency.

In the "llvm-readelf" mode, -long-option is discouraged as it conflicts with grouped short options and it is not accepted by GNU readelf.

While updating the tests, change llvm-readobj -s to llvm-readobj -S to reduce confusion ("s" is --section-headers in llvm-readobj but --symbols in llvm-readelf).

llvm-svn: 359649
diff --git a/llvm/test/tools/llvm-objcopy/ELF/compress-debug-sections-zlib-gnu.test b/llvm/test/tools/llvm-objcopy/ELF/compress-debug-sections-zlib-gnu.test
index 70eb2e8..2abd22e 100644
--- a/llvm/test/tools/llvm-objcopy/ELF/compress-debug-sections-zlib-gnu.test
+++ b/llvm/test/tools/llvm-objcopy/ELF/compress-debug-sections-zlib-gnu.test
@@ -6,9 +6,9 @@
 
 # RUN: llvm-objdump -s %t.o --section=.debug_foo | FileCheck %s
 # RUN: llvm-objdump -s %t-compressed.o | FileCheck %s --check-prefix=CHECK-COMPRESSED
-# RUN: llvm-readobj --relocations -s %t-compressed.o | FileCheck %s --check-prefix=CHECK-FLAGS
-# RUN: llvm-readobj --relocations -s %t-decompressed.o | FileCheck %s --check-prefix=CHECK-HEADER
-# RUN: llvm-readobj --relocations -s %t.o | FileCheck %s --check-prefix=CHECK-HEADER
+# RUN: llvm-readobj --relocations -S %t-compressed.o | FileCheck %s --check-prefix=CHECK-FLAGS
+# RUN: llvm-readobj --relocations -S %t-decompressed.o | FileCheck %s --check-prefix=CHECK-HEADER
+# RUN: llvm-readobj --relocations -S %t.o | FileCheck %s --check-prefix=CHECK-HEADER
 # RUN: llvm-objdump -s %t-decompressed.o --section=.debug_foo | FileCheck %s
 
 # CHECK: .debug_foo: