func ToSymbolFunc(cmd, tmpdir string) (func(string) string, error)
ToSymbolFunc returns a function that may be used to convert a package path into a string suitable for use as a symbol. cmd is the gccgo/GoLLVM compiler in use, and tmpdir is a temporary directory to pass to os.CreateTemp(). For example, this returns a function that converts "net/http" into a string like "net..z2fhttp". The actual string varies for different gccgo/GoLLVM versions, which is why this returns a function that does the conversion appropriate for the compiler in use.