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 #343711
debian

00:00:25

 
  Build+Test
passed #343713
meson-clang

00:04:19

passed #343717
meson-clover

00:09:46

passed #343716
meson-main

00:04:27

passed #343712
meson-swr-glvnd

00:05:40

passed #343718
meson-vulkan

00:02:14

passed #343720
scons-llvm

00:02:48

passed #343719
scons-nollvm

00:05:38

passed #343714
scons-swr

00:06:39

passed #343715
scons-win64

00:06:31