[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/Object/readobj-shared-object.test b/llvm/test/Object/readobj-shared-object.test
index da594af..ab4c712 100644
--- a/llvm/test/Object/readobj-shared-object.test
+++ b/llvm/test/Object/readobj-shared-object.test
@@ -1,14 +1,14 @@
-RUN: llvm-readobj -s -t -dt -dynamic-table -needed-libs \
+RUN: llvm-readobj -S -t --dyn-syms --dynamic-table --needed-libs \
 RUN:              %p/Inputs/shared-object-test.elf-i386 \
 RUN:         | FileCheck %s -check-prefix ELF
-RUN: llvm-readobj -s -t -dt -dynamic-table -needed-libs \
+RUN: llvm-readobj -S -t --dyn-syms --dynamic-table --needed-libs \
 RUN:              %p/Inputs/shared-object-test.elf-i386 \
 RUN:         | FileCheck %s -check-prefix ELF32
 
-RUN: llvm-readobj -s -t -dt -dynamic-table -needed-libs \
+RUN: llvm-readobj -S -t --dyn-syms --dynamic-table --needed-libs \
 RUN:            %p/Inputs/shared-object-test.elf-x86-64 \
 RUN:         | FileCheck %s -check-prefix ELF
-RUN: llvm-readobj -s -t -dt -dynamic-table -needed-libs \
+RUN: llvm-readobj -S -t --dyn-syms --dynamic-table --needed-libs \
 RUN:            %p/Inputs/shared-object-test.elf-x86-64 \
 RUN:         | FileCheck %s -check-prefix ELF64