[llvm] [SampleFDO] Read call-graph matching recovered top-level function profile (PR #101053)

[via llvm-commits]

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+; REQUIRES: x86_64-linux
+; REQUIRES: asserts
+; RUN: opt < %s -passes=sample-profile -sample-profile-file=%S/Inputs/pseudo-probe-stale-profile-toplev-func.prof --salvage-stale-profile --salvage-unused-profile -report-profile-staleness -S --debug-only=sample-profile,sample-profile-matcher,sample-profile-impl -pass-remarks=inline --min-call-count-for-cg-matching=0 --min-func-count-for-cg-matching=0 2>&1 | FileCheck %s -check-prefix=CHECK-TEXT
+; RUN: llvm-profdata merge --sample %S/Inputs/pseudo-probe-stale-profile-toplev-func.prof -extbinary -o %t.extbinary
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WenleiHe wrote:

Do we also want to have a test for text profile just to make sure we handle that properly (no crash, and profiles loaded)?  

https://github.com/llvm/llvm-project/pull/101053