aco: Move is_dead to aco_ir.h to allow it to get inlined.

Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18103>

src/amd/compiler/aco_dead_code_analysis.cpp

@@ -80,18 +80,6 @@ process_block(dce_ctx& ctx, Block& block)
 
 } /* end namespace */
 
-bool
-is_dead(const std::vector<uint16_t>& uses, Instruction* instr)
-{
-   if (instr->definitions.empty() || instr->isBranch() ||
-       instr->opcode == aco_opcode::p_init_scratch)
-      return false;
-   if (std::any_of(instr->definitions.begin(), instr->definitions.end(),
-                   [&uses](const Definition& def) { return !def.isTemp() || uses[def.tempId()]; }))
-      return false;
-   return !(get_sync_info(instr).semantics & (semantic_volatile | semantic_acqrel));
-}
-
 std::vector<uint16_t>
 dead_code_analysis(Program* program)
 {