[clang] [clang] [modules] Add err_main_in_named_module (PR #146247)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `premerge-monolithic-linux` running on `premerge-linux-1` while building `clang` at step 7 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/153/builds/36443

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 7 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'Clang :: Driver/autocomplete.c' FAILED ********************
Exit Code: 1

Command Output (stdout):
--



-###	Print (but do not run) the commands to run for this compilation
--amdgpu-arch-tool=	Tool used for detecting AMD GPU arch in the system.
--analyze	Run the static analyzer
--analyzer-output	Static analyzer report output format (html|plist|plist-multi-file|plist-html|sarif|sarif-html|text).
--ansi	
--config-system-dir=	System directory for configuration files
--config-user-dir=	User directory for configuration files
--config=	Specify configuration file
--coverage	
--cuda-compile-host-device	Compile CUDA code for both host and device (default). Has no effect on non-CUDA compilations.
--cuda-device-only	Compile CUDA code for device only
--cuda-feature=	Manually specify the CUDA feature to use
--cuda-gpu-arch=	
--cuda-host-only	Compile CUDA code for host only. Has no effect on non-CUDA compilations.
--cuda-include-ptx=	Include PTX for the following GPU architecture (e.g. sm_35) or 'all'. May be specified more than once.
--cuda-noopt-device-debug	Enable device-side debug info generation. Disables ptxas optimizations.
--cuda-path-ignore-env	Ignore environment variables to detect CUDA installation
--cuda-path=	CUDA installation path
--driver-mode=	Set the driver mode to either 'gcc', 'g++', 'cpp', 'cl' or 'flang'
--dxv-path=	DXIL validator installation path
--embed-dir=	Add directory to embed search path
--emit-extension-symbol-graphs	Generate additional symbol graphs for extended modules.
--emit-static-lib	Enable linker job to emit a static library.
--end-no-unused-arguments	Start emitting warnings for unused driver arguments
--extract-api-ignores=	Comma separated list of files containing a new line separated list of API symbols to ignore when extracting API information.
--gcc-install-dir=	Use GCC installation in the specified directory. The directory ends with path components like 'lib{,32,64}/gcc{,-cross}/$triple/$version'. Note: executables (e.g. ld) used by the compiler are not overridden by the selected GCC installation
--gcc-toolchain=	Specify a directory where Clang can find 'include' and 'lib{,32,64}/gcc{,-cross}/$triple/$version'. Clang will use the GCC installation with the largest version
--gcc-triple=	Search for the GCC installation with the specified triple.
--gpu-bundle-output	Bundle output files of HIP device compilation
--gpu-instrument-lib=	Instrument device library for HIP, which is a LLVM bitcode containing __cyg_profile_func_enter and __cyg_profile_func_exit
--gpu-max-threads-per-block=	Default max threads per block for kernel launch bounds for HIP
--gpu-use-aux-triple-only	Prepare '-aux-triple' only without populating '-aux-target-cpu' and '-aux-target-feature'.
--help	Display available options
--help-hidden	Display help for hidden options
--hip-device-lib-path=	
--hip-device-lib=	HIP device library
--hip-link	Link clang-offload-bundler bundles for HIP
--hip-path=	HIP runtime installation path, used for finding HIP version and adding HIP include path.
--hip-version=	HIP version in the format of major.minor.patch
--hipspv-pass-plugin=	path to a pass plugin for HIP to SPIR-V passes.
--hipstdpar	Enable HIP acceleration for standard parallel algorithms
--hipstdpar-interpose-alloc	Replace all memory allocation / deallocation calls with hipManagedMalloc / hipFree equivalents
...

```

</details>

https://github.com/llvm/llvm-project/pull/146247