[lld] [lld][ELF] Extend profile guided function ordering to ELF binaries (PR #117514)

[Fangrui Song via llvm-commits]

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+# REQUIRES: aarch64
+
+# RUN: rm -rf %t && split-file %s %t
+# RUN: llvm-mc -filetype=obj -triple=aarch64 %t/a.s -o %t/a.o
+# RUN: llvm-profdata merge %t/a.proftext -o %t/a.profdata
+
+# The code below is the reduced version of the output
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MaskRay wrote:

See https://llvm.org/docs/TestingGuide.html#elaborated-tests

you may want `-fno-exceptions -fno-rtti -fno-asynchronous-unwind-tables`

https://github.com/llvm/llvm-project/pull/117514