This reverts commit 2219b18c.

Reason for revert: Failing to compile on ASAN builders:

https://ci.chromium.org/p/chromium/builders/try/linux-libfuzzer-asan-rel/134782

Currently blocking roll.

Original change's description:
> Vulkan:Optimize SecondaryCommandBuffers
> 
> Optimize performance of SecondaryCommandBuffers and enable them as the
> default build option.
> To disable this set angle_enable_custom_vulkan_cmd_buffers=false in
> your build args.
> 
> This CL enhances the PoolAllocator to have a "fast" mode that can
> be enabled at class creation. This mode uses an alignment of 1 byte and
> enables a fastAllocation() call that avoids some bookkeeping overhead.
> The SecondaryCommandBuffer uses this fastAllocation() function.
> Furthermore the fast path of fast allocate, using the current page,
> is inlined for maximum speed.
> Jamie Madill also updated the SecondaryCommandBuffers to pre-allocate
> blocks so that the commands occur linearly in memory. This speeds up
> processing with improved cache coherency and minimizes overhead when
> recording commands.
> Also the core Draw functions and their state updates are all inlined
> as well as the common functions to initialize commands and to copy
> command pointer data.
> 
> This change also includes some new, custom commands. One is
> imageBarrier that is a specialized version of pipelineBarrier that only
> performs a single image layout transition.
> There are customized versions of various Draw commands to minimize
> copying of parameters.
> There are also specialized commands to bind[Graphics|Compute]Pipeline
> that have the pipeline type built in to the command.
> More custom commands and command data size optimizations will be made
> in follow-on commits.
> 
> Bug: angleproject:3136
> Change-Id: I35453cc2656bc8c51f0d84d1adef106900aca9a5
> Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1497418
> Commit-Queue: Tobin Ehlis <tobine@google.com>
> Reviewed-by: Jamie Madill <jmadill@chromium.org>

TBR=tobine@google.com,syoussefi@chromium.org,jmadill@chromium.org

Change-Id: I1c0bfe864ff343eb8ea6c88556523f8715c981d5
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: angleproject:3136
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1535998Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>