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: I5d98d2300ce83496f9b82c9b973f679701448474