Add more options to tools/compiledump.py

* Add --enable-test-assertions to enable test assertions. This is no
  longer the default
* Add option for passing JVM options

One use case for passing JVM options to only enable assertions for a
specific class:

  tools/compiledump.py \
      --disable_assertions \
      -J-ea:com.android.tools.r8.ir.optimize.DeadCodeRemover \
      ...

Bug: b/312926551
Change-Id: Ib1eb4d72fd9acca6f84f2401128742246794dba6