[clang] [clang][bytecode] Fix discarding ImplitiValueInitExprs (PR #170089)

[via cfe-commits]

github-actions[bot] wrote:

<!--PREMERGE ADVISOR COMMENT: Linux-->
# :penguin: Linux x64 Test Results

* 84776 tests passed
* 1122 tests skipped
* 1 test failed

## Failed Tests
(click on a test name to see its output)

### Clang
<details>
<summary>Clang.AST/ByteCode/c.c</summary>

```
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 1
/home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/clang -cc1 -internal-isystem /home/gha/actions-runner/_work/llvm-project/llvm-project/build/lib/clang/22/include -nostdsysteminc -triple x86_64-linux -verify=expected,all                   -std=c11 -Wcast-qual           /home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/AST/ByteCode/c.c -fexperimental-new-constant-interpreter
# executed command: /home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/clang -cc1 -internal-isystem /home/gha/actions-runner/_work/llvm-project/llvm-project/build/lib/clang/22/include -nostdsysteminc -triple x86_64-linux -verify=expected,all -std=c11 -Wcast-qual /home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/AST/ByteCode/c.c -fexperimental-new-constant-interpreter
# note: command had no output on stdout or stderr
# RUN: at line 2
/home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/clang -cc1 -internal-isystem /home/gha/actions-runner/_work/llvm-project/llvm-project/build/lib/clang/22/include -nostdsysteminc -triple x86_64-linux -verify=pedantic,pedantic-expected,all -std=c11 -Wcast-qual -pedantic /home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/AST/ByteCode/c.c -fexperimental-new-constant-interpreter
# executed command: /home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/clang -cc1 -internal-isystem /home/gha/actions-runner/_work/llvm-project/llvm-project/build/lib/clang/22/include -nostdsysteminc -triple x86_64-linux -verify=pedantic,pedantic-expected,all -std=c11 -Wcast-qual -pedantic /home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/AST/ByteCode/c.c -fexperimental-new-constant-interpreter
# .---command stderr------------
# | error: diagnostics with 'warning' severity seen but not expected: 
# |   File /home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/AST/ByteCode/c.c Line 397: empty struct is a GNU extension
# |   File /home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/AST/ByteCode/c.c Line 403: use of an empty initializer is a C23 extension
# |   File /home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/AST/ByteCode/c.c Line 403: expression is not an integer constant expression; folding it to a constant is a GNU extension
# | 3 errors generated.
# `-----------------------------
# error: command failed with exit status: 1

--

```
</details>

If these failures are unrelated to your changes (for example tests are broken or flaky at HEAD), please open an issue at https://github.com/llvm/llvm-project/issues and add the `infrastructure` label.

https://github.com/llvm/llvm-project/pull/170089