[llvm] [Object] Beginnings of SFrame parser and dumper (PR #147294)

[Pavel Labath via llvm-commits]

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+## Check parsing and dumping of the SFrame header.
+# RUN: yaml2obj --docnum=1 %s -o %t.1
+# RUN: llvm-readobj --sframe=.sframe_1b --sframe=.sframe_bad_magic \
+# RUN:   --sframe=.sframe_bad_version --sframe=.sframe_6b \
+# RUN:   --sframe=.sframe_header %t.1 2>&1 | FileCheck %s --check-prefix=CASE1
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labath wrote:

Done.

https://github.com/llvm/llvm-project/pull/147294