Revert "Revert "Compiler Optimizations""

This reverts commit 25f6642991b5c0b26e8c45b4ad2f4cc68a89545c.

Conflicts:
	core/combo/TARGET_linux-arm.mk
	core/combo/select.mk

Change-Id: I94d24a6985757fae4a7160518f77d46b7314203f