radv: Implement VK_AMD_shader_info

radv: Implement VK_AMD_shader_info

This allows an app to query shader statistics and get a disassembly of
a shader. RenderDoc git has support for it, so this allows you to view
shader disassembly from a capture.

When this extension is enabled on a device (or when tracing), we now
disable pipeline caching, since we don't get the shader debug info when
we retrieve cached shaders.

v2: Improvements to resource usage reporting
v3: Disassembly string must be null terminated (string_buffer's length
    does not include the terminator)
v4: Fixed LDS reporting. (Bas)

Signed-off-by: Alex Smith <asmith@feralinteractive.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>