Use store barrier instead of full barrier.

Make use of ANDROID_MEMBAR_STORE when appropriate.  In mterp, define a
new SMP_DMB_ST macro that will (soon) expand into "dmb st" on ARMv7-A
platforms configured for SMP.

Bug 3003477.

Change-Id: I03c09e93e1374d1c668588c9ad52f5c08d3d2435
16 files changed