Be less aggressive when inlining.

Reduce the threshold for cumulated dex registers, to prevent
long and memory expensive compiles.

bug: 62243120 (3d party app startup)
bug: 36727951 (Camera startup)
bug: 62271612 (compiler allocations)
Test: test.py
Change-Id: I8fd5cd7aed3c4e677f0aa15af676b959cc6ddac2