[LLVM] Disable IO sandbox in symbolizeAddresses (#194597)
The function `symbolizeAddresses` is used by debugify to symbolize
addresses captured in the current invocation of LLVM, which it does by
executing llvm-symbolizer with temporary input and output files.
Creating the temporary files has an explicit sandbox exclusion, as
temporary files are necessarily not part of the compiler's formal
output, but attempting to read back the output file via MemoryBuffer
triggers a sandbox violation. Since we are always only operating on
temporary files within symbolizeAddresses, this patch disables the IO
sandbox in that function.
