llvm/llvm/test/tools/llvm-ifs/fail-file-write.test

## Test failing to write output file on non-windows platforms.

# UNSUPPORTED: system-windows
# REQUIRES: non-root-user
# RUN: rm -rf %t.TestDir
# RUN: mkdir %t.TestDir
# RUN: touch %t.TestDir/Output.TestFile
# RUN: chmod 400 %t.TestDir
# RUN: not llvm-ifs --output-elf=%t.TestDir/Output.TestFile %s 2>&1 | FileCheck -DMSG=%errc_EACCES %s --check-prefix=ERR
# RUN: chmod 777 %t.TestDir
# RUN: rm -rf %t.TestDir

--- !ifs-v1
IfsVersion: 3.0
Target: { ObjectFormat: ELF, Arch: AArch64, Endianness: little, BitWidth: 64 }
Symbols: []
...

# ERR: [[MSG]] when trying to open `{{.*}}.TestDir/Output.TestFile` for writing