[llvm] [llvm-ar][Object][COFF] Add support for EC symbols to llvm-ar. (PR #85230)

[James Henderson via llvm-commits]

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+## Test that ECSYMBOLS section is created when ARM64EC is used.
+
+# RUN: yaml2obj %s -o %t.arm64ec.obj -DMACHINE=IMAGE_FILE_MACHINE_ARM64EC
+# RUN: yaml2obj %s -o %t.arm64.obj -DMACHINE=IMAGE_FILE_MACHINE_ARM64
+# RUN: yaml2obj %s -o %t.amd64.obj -DMACHINE=IMAGE_FILE_MACHINE_AMD64
+
+## Create ARM64EC archive
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jh7370 wrote:

```suggestion
## Create ARM64EC archive.
```
Nit here and below.

https://github.com/llvm/llvm-project/pull/85230