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

(cherry picked from commit f81621ea)

Change-Id: I25b37e1226af1659934adceb9e3c9e3f12ebd4bd