Don't call EnsureInitialized in the JIT.

Calling EnsureInitialized can block due to locking on the class
object, that an application can also do.

Just rely that the compilation request is for a reason.

The compiler aleady knows how to compile methods of classes that
are not initialized.

bug: 62243120
Test: test.py --jit

(cherry picked from commit 23ddfe86)

Change-Id: I21157fd9ab5589f0ec8e18ac321b2ac7177ad9b2