delve: Missing debug_info entries and text symbols for some functions on macOS with cgo

Please answer the following before submitting your issue:

Note: Please include any substantial examples (debug session output, stacktraces, etc) as linked gists.

1. What version of Delve are you using (dlv version)? 1.2.0
2. What version of Go are you using? (go version)? 1.12.7
3. What operating system and processor architecture are you using? Mac OS 10.14.5, darwin/amd64
4. What did you do? I’ve tried to set breakpoint in the nested packages of my project by break <project>/cmd/root.go:28
5. What did you expect to see? Breakpoint is set
6. What did you see instead? Command failed: could not find /Users/<user>/Projects/go/src/<project>/cmd/root.go:28 (this file exists)

It works fine with main.go in the project root:

(dlv) break <project>/main.go:6
Breakpoint 1 set at 0x49d331b for main.main() ./main.go:6

But doesn’t work with any packages inside.