Update vixl/arm32 backend after new allocation entrypoint change.

Fix after https://android-review.googlesource.com/#/c/325419/

Spotted by artem.serov@linaro.org. Thanks!

test: test-art-target with vixl/arm32
Change-Id: I5fdb4836c80f98696b07a06f52919f33a6284fbc
1 file changed