[llvm-readobj] - Do not report invalid amount of sections.

When output style is GNU and amount of sections is >= SHN_LORESERVE,
llvm-readobj reports zero number of sections instead of actual value.

The patch fixes that.

Differential revision: https://reviews.llvm.org/D49544

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@337462 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed