Revert "Change RequiresConstructorBarrier default to yes"

CL https://android-review.googlesource.com/#/c/213119/ is
breaking run-test 476-checker-ctor-memory-barrier on ARM
and ARM64.

Bug: 28005874

This reverts commit f2f0f4b0b9185fe0b6d1fb22744a871c96296db2.

Change-Id: Ic6e97ab07358406c07c654ac9de700f0186f15f8
2 files changed