Extend OmaxLTO options

This patch modifies extends OmaxLTO to make use of extra
optimisation flags which affect LTO.

Change-Id: I4b652fc171e043af4143081f216403bd5b602b85

Author: nasherm

OmaxLTO.cfg

@@ -1,5 +1,11 @@
--flto=full \
+-flto=full -fuse-linker-plugin \
 -fvirtual-function-elimination \
 -fwhole-program-vtables \
--Wl,-plugin-opt=-extra-LTO-loop-unroll=true
+-Wl,-plugin-opt=-extra-LTO-loop-unroll=true \
+-Wl,-plugin-opt=-inline-threshold=500 \
+-Wl,-plugin-opt=-unroll-threshold=450 \
+-Wl,-plugin-opt=-unroll-partial-threshold=450 \
+-Wl,-plugin-opt=-unroll-max-iteration-count-to-analyze=20 \
+-Wl,-plugin-opt=-lsr-complexity-limit=1073741823 \
+-Wl,-plugin-opt=-force-attribute=main:norecurse \