Use NV glsl shader compiler for Vulkan

Use NV glsl shader compiler for Vulkan

The nvidia direct glsl shader compiler seems to perform much better than using
shaderc to compile to spir-v first.

This change also includes a change to prefer host cached memory for buffers.
Having cached buffers signifcantly improves performance whenever we need to do
buffer reads and writes.

BUG=skia:
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Review URL: https://codereview.chromium.org/1835813003