FROMLIST: glsl/nir: do not change an element index to have correct block name

Fixes: 810dde2 "glsl/nir: Add a pass to lower UBO and SSBO access"
Signed-off-by: Andrii Simiklit <andrii.simiklit@globallogic.com>

TEST=[CTS 9.0_r8} dEQP-GLES31.functional.ssbo.layout.random.all_per_block_buffers#18
(am from https://gitlab.freedesktop.org/mesa/mesa/merge_requests/332)
Signed-off-by: Kevin Strasser <kevin.strasser@intel.com>

Author: asimiklit

src/compiler/glsl/gl_nir_lower_buffers.c

@@ -48,7 +48,6 @@ get_block_array_index(nir_builder *b, nir_deref_instr *deref,
 
       if (nir_src_is_const(deref->arr.index)) {
          unsigned arr_index = nir_src_as_uint(deref->arr.index);
-         arr_index = MIN2(arr_index, arr_size - 1);
 
          /* We're walking the deref from the tail so prepend the array index */
          block_name = ralloc_asprintf(b->shader, "[%u]%s", arr_index,