support eh_frame if debug_frame is not present

[lshulyay]

Please note that I am not sure if this is an issue with Delve not fully supporting Go 1.10rc1 or with Go 1.10rc1 itself/something not being built with the correct flags. As the error comes from Delve code I'm filing it here first.

1. What version of Delve are you using (dlv version)?

Version: 1.0.0-rc.2

2. What version of Go are you using? (go version)?

go version go1.10rc1 linux/amd64

3. What operating system and processor architecture are you using?
Fedora 26; GOARCH="amd64"

4. What did you do?

Tried to run with debugger attached through Jetbrains Goland on a project that imports plugin. Goland setup scripts are as follows:

GOROOT=/home/lazer/sdk/go1.10rc1 #gosetup
GOPATH=/home/lazer/go #gosetup
/home/lazer/sdk/go1.10rc1/bin/go test -c -o /tmp/___1auth0_test_go -gcflags "all=-N -l" gitlab.com/drakonka/gosnaillife/server/lib/infrastructure/auth/cli/auth0/tests #gosetup
/home/lazer/Apps/goland/plugins/intellij.go/lib/dlv/linux/dlv --listen=localhost:37591 --headless=true --api-version=2 --backend=default exec /tmp/___1auth0_test_go -- -test.v -test.run "^TestAuth0Signup|TestAuth0Login|TestAuth0Logout$" #gosetup

5. What did you expect to see?

I expected the tests to start and break at the first breakpoint.

6. What did you see instead?

could not launch process: could not find .debug_frame section in binary

I am able to repro this by simply putting in some dummy code using "plugin" in my package, eg:

	test := plugin.Plugin{}
	fmt.Println(test)

The above attaches fine on Go 1.9, but not Go 1.10rc1

[aarzilli]

Looks like 1.10 can't emit debug symbols when plugin is imported. This isn't a bug with delve and will be tracked on the go repository at golang/go#23733.