anv: Add support for INTEL_DEBUG=bt

Print all the bindings, with the corresponding BTI or nothing in case
of bindless.  Output looks like

    Bindings for MESA_SHADER_COMPUTE
      [000] anv num work groups
      [001] anv buffer for set 0
      [002] anv shader constants
            VK_DESCRIPTOR_TYPE_STORAGE_BUFFER 0:0
10 jobs for !1038 with r/anv-debug-bt in 19 minutes and 31 seconds (queued for 3 seconds)
detached
Status Job ID Name Coverage
  Containers Build
passed debian #343711

00:00:25

 
  Build+Test
passed meson-clang #343713

00:04:19

passed meson-clover #343717

00:09:46

passed meson-main #343716

00:04:27

passed meson-swr-glvnd #343712

00:05:40

passed meson-vulkan #343718

00:02:14

passed scons-llvm #343720

00:02:48

passed scons-nollvm #343719

00:05:38

passed scons-swr #343714

00:06:39

passed scons-win64 #343715

00:06:31