Fix FOUR_ARG_DOWNCALL assembly stubs on arm and x86.

They were creating a stack that the runtime did not understand.

bug:28348339

(cherry picked from commit 0f838aa279a296b5f14c231065bb2f96b02d9caf)

Change-Id: Iecaa274512b42ad76fccb48c11a0076d0292c240
5 files changed