[llvm] Fix crash due to un-checked error in LVReaderHandler::handleArchive method (PR #118951)

[Carlos Alberto Enciso via llvm-commits]

CarlosAlbertoEnciso wrote:

This is the directory for the `llvm-debuginfo-analyzer` [tests](https://github.com/llvm/llvm-project/tree/main/llvm/test/tools/llvm-debuginfo-analyzer). They are divided into `DWARF`, `COFF` and `WebAssembly`.

You can check the tests for `llvm-dwarfdump` [archive](https://github.com/llvm/llvm-project/blob/main/llvm/test/tools/llvm-dwarfdump/X86/archive.test). There is already an input file.

The test file can be in the `DWARF` directory.
The command line for the test file would include some lines like:

```
; RUN: llvm-debuginfo-analyzer --attribute=format \
; RUN:                         --print=scopes \
; RUN:                         %S/../../dsymutil/Inputs/libfat-test.a 2>&1 | \
; RUN: FileCheck --strict-whitespace %s

; CHECK:      Logical View:
; CHECK-NEXT: [000]           {File} 'libfat-test.a' -> Mach-O 64-bit x86-64
; CHECK-EMPTY:
; CHECK-NEXT: [001]             {CompileUnit} 'fat-test.c'
more lines ...
```

Additional information: [filecheck](https://llvm.org/docs/CommandGuide/FileCheck.html), [llvm testing](https://llvm.org/docs/TestingGuide.html).

Any question, please do let me know. Happy to help.

https://github.com/llvm/llvm-project/pull/118951