changed to slab allocator, testing with linaro gcc 4.9 if boot
new defconfig with slab allocator along with -O3 optimizations set. TESTING
memset.S patches for gcc 4.8 

https://dev.openwrt.org/browser/trunk/target/linux/generic/patches-3.3/001-ARM-7668-1-fix-memset-related-crashes-caused-by-rece.patch?rev=39902
https://dev.openwrt.org/browser/trunk/target/linux/generic/patches-3.3/002-ARM-7668-1-fix-memset-related-crashes-caused-by-rece.patch?rev=39902
Revert "changed to slab allocator, testing with linaro gcc 4.9 if boot"
Not necessary since added change to separate defconfig to test.

This reverts commit 5e5c04ab39a657c6fda93a8fc427aa635c8df4fd.
changed slab to slub allocator in my personal defconfig