aco: fix assertion fail when program contains empty block

radeonsi may generate empty main shader or an empty exit block
for p_end_with_regs to jump to.

Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Signed-off-by: Qiang Yu <yuq825@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24973>

src/amd/compiler/aco_print_asm.cpp

@@ -345,7 +345,7 @@ print_asm_llvm(Program* program, std::vector<uint32_t>& binary, unsigned exec_si
    unsigned prev_size = 0;
    unsigned prev_pos = 0;
    unsigned repeat_count = 0;
-   while (pos < exec_size) {
+   while (pos <= exec_size) {
       bool new_block =
          next_block < program->blocks.size() && pos == program->blocks[next_block].offset;
       if (pos + prev_size <= exec_size && prev_pos != pos && !new_block &&
@@ -361,6 +361,10 @@ print_asm_llvm(Program* program, std::vector<uint32_t>& binary, unsigned exec_si
 
       print_block_markers(output, program, referenced_blocks, &next_block, pos);
 
+      /* For empty last block, only print block marker. */
+      if (pos == exec_size)
+         break;
+
       char outline[1024];
       std::pair<bool, size_t> res = disasm_instr(program->gfx_level, disasm, binary.data(),
                                                  exec_size, pos, outline, sizeof(outline));