Reset JIT method counters to 0 instead of 1 when clearing.

When the counters need to be cleared, the count should reset to 1
instead of 0. The counters may be reset during startup, and startup
methods can be lost by resetting the counters to 0.

Bug: 62200509
Test: mm test-art-host
Change-Id: I8936631d3bab369c6a14acf76b20e7245de14789