[Reland] Use llvm symbolizer for stack script. llvm symbolizer is a more efficient symbolizer than addr2line, objdump, etc. In this cl, I 1)created a wrapper instance to interact with llvm symbolizer, 2)made the stack script to use llvm symbolizer instance, and then 3)added llvm symbolizer into isolated inputs. The reland is to fix: 1UnboundLocalError: local variable 'code_addr' referenced before assignment 2AttributeError: 'module' object has no attribute 'ToolPath' TBR=dpranke@chromium.org,agrieve@chromium.org Bug: 774267 Change-Id: Iee626065e4cfe9403f9b13dfec2dfd99e749510c Reviewed-on: https://chromium-review.googlesource.com/834754 Reviewed-by: John Budorick <jbudorick@chromium.org> Reviewed-by: Zhiling Huang <hzl@chromium.org> Commit-Queue: Zhiling Huang <hzl@chromium.org> Cr-Original-Commit-Position: refs/heads/master@{#526304} Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src Cr-Mirrored-Commit: ed89eb8fd900951e7f7a604f460d1b1c2ea3c5261 file changed
