debug/dwarf: improve error when debugging information is absent

[glzbcrt]

While debugging an application using Delve I got the cryptic error:

*decoding dwarf section info at offset 0x0: too short.*

After spending some time debugging the debugger I found out that the
application was built without debugging information, generating this error
message. This PR will improve the error message to help people quickly find
the root cause.

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Patch Set 1:

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Patch Set 2: Code-Review+1

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Patch Set 4: Commit-Queue+1

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Patch Set 4:

This CL has failed the run. Reason:

Tryjob golang/try/gotip-windows-386 has failed with summary (view all results):

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• go on master (change 625897)

Build or test failure, click here for results.

To reproduce, try gomote repro 8731540014947155025.

Additional links for debugging:

• Output for go tool dist test -json [shard 2]

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Patch Set 5: Auto-Submit+1 Code-Review+2 Commit-Queue+1

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Patch Set 6:

(2 comments)

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Patch Set 6: Auto-Submit+1 Commit-Queue+1

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Patch Set 6:

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Patch Set 6: Code-Review+2

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Patch Set 6: -Commit-Queue

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Patch Set 6:

This CL has failed the run. Reason:

Tryjob golang/try/gotip-windows-386 has failed with summary (view all results):

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• go on master (change 625897)

Build or test failure, click here for results.

To reproduce, try gomote repro 8731454948755171521.

Additional links for debugging:

• Output for go tool dist test -json [shard 1]

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Patch Set 6: LUCI-TryBot-Result-1

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