Update MaybeAddExtraGotoBlocks to bail for irreducible loops

We may have graphs with irreducible loops at this point and
recomputing the loop information is not supported.

Bug: 253242440
Test: dex2oat compiling the apps in the bug
Change-Id: I181b4fb9d9812ba2f14cd21602cf0e5a4e1fd18e
8 files changed