Properly de-duplicate debug symbol names.

The simple approach was good up till now, but the interpreter
methods names are not near the compiled methods name, so use
proper full map to ensure we do not store the same name twice.

Bug: 71579677
Test: testrunner.py --host -t 137
Change-Id: I529a3b097ed20a68ad46454b47a8f8c3223f534d