Refactor CompilerDriver::CompileAll().

Treat verification results and image classes as mutable
only in CompilerDriver::PreCompile(), and treat them as
immutable during compilation, accessed through the
CompilerOptions. This severs the dependency of the inliner
on the CompilerDriver.

Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Change-Id: I594a0213ca6a5003c19b4bd488af98db4358d51d