Merge remote-tracking branch 'aosp/upstream' into master

* aosp/upstream:
  Fix globs matching files with wildcard characters in the name
  Report panic context for SingletonContext.VisitAllModules
  Fix issues found by `go vet`
  Add go.mod for go1.11 module support

Test: m checkbuild
Change-Id: Ic7a9248652c4c799559240aeef1e4f6e5292582e