Add inline to RosAlloc::AllocFromCurrentRunUnlocked().
Add inline to RosAlloc::AllocFromCurrentRunUnlocked().

This appears to make MemAllocTest faster by up to ~200 ms.

Bug: 14493155
Bug: 9986565
Change-Id: I1b8ba1f3cecfa9e5b6fdc53f3ae00450be6023a8

treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst