[clang] [ClangRepl] Reland Semanic Code Completion (PR #75556)

[Vladimir Vereschaka via cfe-commits]

vvereschaka wrote:

@vgvassilev thank you. This patch looks promising, the tests have been passed successfully with it

```
-- Testing: 21 of 19608 tests, 21 workers --
PASS: Clang-Unit :: Interpreter/./ClangReplInterpreterTests.exe/8/21 (1 of 21)
PASS: Clang-Unit :: Interpreter/./ClangReplInterpreterTests.exe/3/21 (2 of 21)
PASS: Clang-Unit :: Interpreter/./ClangReplInterpreterTests.exe/5/21 (3 of 21)
PASS: Clang-Unit :: Interpreter/./ClangReplInterpreterTests.exe/1/21 (4 of 21)
PASS: Clang-Unit :: Interpreter/./ClangReplInterpreterTests.exe/7/21 (5 of 21)
PASS: Clang-Unit :: Interpreter/./ClangReplInterpreterTests.exe/4/21 (6 of 21)
PASS: Clang-Unit :: Interpreter/./ClangReplInterpreterTests.exe/0/21 (7 of 21)
PASS: Clang-Unit :: Interpreter/./ClangReplInterpreterTests.exe/6/21 (8 of 21)
PASS: Clang-Unit :: Interpreter/./ClangReplInterpreterTests.exe/12/21 (9 of 21)
PASS: Clang-Unit :: Interpreter/./ClangReplInterpreterTests.exe/2/21 (10 of 21)
PASS: Clang-Unit :: Interpreter/./ClangReplInterpreterTests.exe/9/21 (11 of 21)
PASS: Clang-Unit :: Interpreter/./ClangReplInterpreterTests.exe/11/21 (12 of 21)
PASS: Clang-Unit :: Interpreter/./ClangReplInterpreterTests.exe/10/21 (13 of 21)
PASS: Clang-Unit :: Interpreter/./ClangReplInterpreterTests.exe/17/21 (14 of 21)
PASS: Clang-Unit :: Interpreter/./ClangReplInterpreterTests.exe/18/21 (15 of 21)
PASS: Clang-Unit :: Interpreter/./ClangReplInterpreterTests.exe/16/21 (16 of 21)
PASS: Clang-Unit :: Interpreter/./ClangReplInterpreterTests.exe/15/21 (17 of 21)
PASS: Clang-Unit :: Interpreter/./ClangReplInterpreterTests.exe/19/21 (18 of 21)
PASS: Clang-Unit :: Interpreter/./ClangReplInterpreterTests.exe/20/21 (19 of 21)
PASS: Clang-Unit :: Interpreter/./ClangReplInterpreterTests.exe/14/21 (20 of 21)
PASS: Clang-Unit :: Interpreter/./ClangReplInterpreterTests.exe/13/21 (21 of 21)
```

https://github.com/llvm/llvm-project/pull/75556