Fix crash running blur on 4K images

bug 11258120

The temporary buffer could be misaligned due to realloc only
aligning to 8 bytes.

Fix issues with with Histogram and 2/3 vector sizes.

Change-Id: I271f4635ead5ff0a7e7f89bb5cfcbc2bba626e22
Create a cache directory for our symlinked files if necessary.

Bug: 11519886

Change-Id: I93d3c194a15e4842455c31406095e90bced882ee
Fix histogram intrinsic.

bug 11676706

Change-Id: I12ac5ed5f8528574619feb9737737d0111ad0be6