[GN]: Include asmflags in ConfigValues::AppendValues

This ensures that any subconfig asmflags values apply to a config that
references it.

BUG=none
TBR=brettw@chromium.org

Review URL: https://codereview.chromium.org/1376733005

Cr-Original-Commit-Position: refs/heads/master@{#351583}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 1437d0fd62fe019f3cb9f663f81da5d4233e1044
1 file changed
tree: 48c756417fe8c8ac93de842f2d0d78b78b74ce0d
  1. tools/