[llvm] [memprof] Remove MemProf format Version 1 (PR #117357)

[Vladimir Vereschaka via llvm-commits]

vvereschaka wrote:

Hi @kazutakahirata,

There is the same problem on [llvm-clang-x86_64-expensive-checks-ubuntu](https://lab.llvm.org/buildbot/#/builders/187) builder.
```
/home/buildbot/worker/as-builder-4/ramdisk/expensive-checks/llvm-project/llvm/lib/ProfileData/InstrProfReader.cpp: In member function ‘llvm::Error llvm::IndexedMemProfReader::deserialize(const unsigned char*, uint64_t)’:
/home/buildbot/worker/as-builder-4/ramdisk/expensive-checks/llvm-project/llvm/lib/ProfileData/InstrProfReader.cpp:1355:27: error: ‘Version1’ is not a member of ‘llvm::memprof’; did you mean ‘Version3’?
 1355 |   if (Version <= memprof::Version1)
      |                           ^~~~~~~~
      |                           Version3
```

https://github.com/llvm/llvm-project/pull/117357