nir: Add nir_const_value_negative_equal

v2: Rebase on 1-bit Boolean changes.

Reviewed-by: Thomas Helland <thomashelland90@gmail.com> [v1]
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/compiler/nir/nir.h

@@ -988,6 +988,12 @@ nir_ssa_alu_instr_src_components(const nir_alu_instr *instr, unsigned src)
    return instr->dest.dest.ssa.num_components;
 }
 
+bool nir_const_value_negative_equal(const nir_const_value *c1,
+                                    const nir_const_value *c2,
+                                    unsigned components,
+                                    nir_alu_type base_type,
+                                    unsigned bits);
+
 bool nir_alu_srcs_equal(const nir_alu_instr *alu1, const nir_alu_instr *alu2,
                         unsigned src1, unsigned src2);