[clang] [clang-repl] Address error recovery fixing infinite loop while parsing (PR #127569)

[Anutosh Bhat via cfe-commits]

anutosh491 wrote:

Thanks for the review here @vgvassilev

I think I've framed the test file correctly but the CI shows me 
```
FAIL: Clang :: Interpreter/repl-input-end-recovery.cpp (23865 of 23865)
******************** TEST 'Clang :: Interpreter/repl-input-end-recovery.cpp' FAILED ********************
Exit Code: 1
Command Output (stdout):
--
# RUN: at line 2
cat /home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/Interpreter/repl-input-end-recovery.cpp | /home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/clang-repl -Xcc -Xclang -Xcc -verify -Xcc -Xclang -Xcc -verify-ignore-unexpected | /home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/FileCheck /home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/Interpreter/repl-input-end-recovery.cpp
# executed command: cat /home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/Interpreter/repl-input-end-recovery.cpp
# note: command had no output on stdout or stderr
# executed command: /home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/clang-repl -Xcc -Xclang -Xcc -verify -Xcc -Xclang -Xcc -verify-ignore-unexpected
# .---command stderr------------
# | error: Parsing failed.
# | error: Parsing failed.
# | error: Parsing failed.
# | error: Parsing failed.
# | error: 'expected-error' diagnostics expected but not seen: 
# |   File  Line 1: expected '}'
# |   File  Line 1: expected '}'
# `-----------------------------
# error: command failed with exit status: 1
# executed command: /home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/FileCheck /home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/Interpreter/repl-input-end-recovery.cpp
# note: command had no output on stdout or stderr
--
********************
```
Am I missing something obvious here !?

https://github.com/llvm/llvm-project/pull/127569