debug/pe: do not create symbol table if FileHeader.PointerToSymbolTable is 0
https://github.com/tpn/pdfs/raw/master/Microsoft Portable Executable and Common Object File Format Specification - 1999 (pecoff).doc
says this about PointerToSymbolTable:
File offset of the COFF symbol table or 0 if none is present.
Do as it says.
Fixes #17809.
Change-Id: Ib1ad83532f36a3e56c7e058dc9b2acfbf60c4e72
Reviewed-on: https://go-review.googlesource.com/33170
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Alex Brainman <alex.brainman@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>