Move jacoco before desugar

R8 will replace desugar+proguard+dx, which will mean jacoco has to
run before desugar.  In preparation, move jacoco before desugar now.

Test: m EMMA_INSTRUMENT=true EMMA_INSTRUMENT_FRAMEWORK=true SKIP_BOOT_JARS_CHECK=true WITH_DEXPREOPT=false tests
Change-Id: I0627a79ba2f0b26a113d5d8bcc5cb1fda08295a1