Regression test for issue with VIXL AArch64 veneer pool.

Dex2oat used to crash on this assertion:

  external/vixl/src/aarch64/macro-assembler-aarch64.cc:245: void vixl::aarch64::VeneerPool::CheckEmitFor(size_t, vixl::aarch64::Pool::EmitOption): assertion "masm_->GetCursorOffset() < unresolved_branches_.GetFirstLimit()" failed

Test: test-art-target (on ARM64)
Bug: 34850123
Change-Id: I425a7d612cc20bf2a6fb1125028af35a73794b52