[llvm-bugs] [Bug 51624] New: "llvm-profdata merge" doesn't work in 13.0

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=51624

            Bug ID: 51624
           Summary: "llvm-profdata merge" doesn't work in 13.0
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: bero at lindev.ch
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

Doing something along the lines of 
export LLVM_PROFILE_FILE=xyz-%p.profile.d
export CFLAGS="-O2 -fprofile-instr-generate"
export CXXFLAGS="-O2 -fprofile-instr-generate"
./configure
make
# Run the generated binaries in some expected ways, e.g. "make check"
llvm-profdata merge --output=xyz.profile xyz-*.profile.d

consistently (obviously with PIDs varying) results in
warning: xyz-670250.profile.d: malformed instrumentation profile data
warning: xyz-670257.profile.d: malformed instrumentation profile data
error: no profile can be merged

The *.profile.d files look ok at a first glance, and "file" recognizes them as
"LLVM raw profile data, version 7".

Looks like only "llvm-profdata merge" is broken, using -fprofile-instr-use=<any
of the individual files> seems to be ok.

This is a regression from 12.x.

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