Use 32 or 64 bit dex2oat explicitly depending on HOST_PREFER_32_BIT.

Since dex2oat(d) binaries now always are multilib=both, we need to pick
the right variant explicitly.

Test: lunch sdk-eng && art/tools/buildbot-build.sh --host && \
  art/test/run-test --host --optimizing 641-checker-arraycopy
  (with and without HOST_PREFER_32_BIT=true)
Bug: 148372405
Change-Id: I7edbff69c3a21d872aa02413718500410c6d1786
1 file changed