Validation layer reports errors if memory object alias same memory

[misojarv]

Memory objects are allowed to alias. See "11.8 Memory Aliasing" in the spec.

Triggered by CTS tests:
dEQP-VK.memory.pipeline_barrier.*

[lentinem]

Please post the error you found.

[misojarv]

The error messages are:
"ERROR: Buffer 33d7f30 is alised with image 33f2fc0 (code 0x00000003 at Buffer:0)"
"ERROR: Image 3426160 is alised with buffer 33d7f30 (code 0x00000003 at Image:0)"

The test case does make sure that they are never used at the same time and that correct pipeline barriers are used.

[mark-lunarg]

Aliasing memory objects will no longer result in validation errors. #1264 has taken care of this for the most part.