Read dexopt concurrency from phenotype flags. Bug: 307231036 Test: atest ArtServiceTests (cherry picked from https://android-review.googlesource.com/q/commit:23bdf0606a4d97050de96dfb5a87c32587721579) Merged-In: I7179d2c46bc4a1e11e8403efe6e0d8bcb159aa0f Change-Id: I7179d2c46bc4a1e11e8403efe6e0d8bcb159aa0f