Most linked executables do not have a symbol table in COFF.
However, it is pretty typical to have some export entries. Use those
entries to inform the disassembler about potential function definitions
and call targets.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@253429 91177308-0d34-0410-b5e6-96231b3b80d8