[llvm] [llvm-objcopy][COFF] Support --rename-section (PR #210573)

[James Henderson via llvm-commits]

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+# RUN: yaml2obj %s -o %t
+
+## Basic rename: section header, contents, alignment, and section symbol.
+# RUN: llvm-objcopy --rename-section=.foo=.bar %t %t2
+# RUN: llvm-readobj --sections --section-data --symbols %t2 | FileCheck %s
+
+## Bad format / multiple renames of the same source (CLI, format-agnostic).
+# RUN: not llvm-objcopy --rename-section=.foo.bar --rename-section=.foo=.other %t %t2 2>&1 | \
+# RUN:   FileCheck %s --check-prefix=BAD-FORMAT
+# RUN: not llvm-objcopy --rename-section=.foo=.bar --rename-section=.foo=.other %t %t2 2>&1 | \
+# RUN:   FileCheck %s --check-prefix=MULTIPLE-RENAMES
+
+## Section renames do not chain in one invocation.
+# RUN: llvm-objcopy --rename-section=.foo=.bar --rename-section=.bar=.baz %t %t3
+# RUN: cmp %t2 %t3
+
+## Renaming a nonexistent section is a silent no-op.
+# RUN: llvm-objcopy --rename-section=.missing=.other %t %t4
+# RUN: cmp %t %t4
+
+## Empty new name is allowed (matches LLVM ELF and COFF --add-section).
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jh7370 wrote:

Nit: I don't think we need to call out matching ELF here, since we have the pre-existing COFF behaviour. Just put "(matches --add-section)"

https://github.com/llvm/llvm-project/pull/210573