shader: add missing RDNA2 ALU opcodes

Add missing scalar and vector opcodes with compute tests.

Original work by @Pouare514 in #176.

Co-authored-by: Pouare514 <julienaulycee@gmail.com>

src/graphics/shader/recompiler/frontend/decode/ShaderDecoder.h

@@ -40,6 +40,7 @@ enum class Opcode {
 	S_MOV_B64,
 	S_MOVK_I32,
 	S_ABS_I32,
+	S_ABSDIFF_I32,
 	S_BREV_B32,
 	S_BCNT1_I32_B32,
 	S_BCNT1_I32_B64,
@@ -69,6 +70,8 @@ enum class Opcode {
 	S_BITCMP1_B32,
 	S_BITSET0_B32,
 	S_BITSET1_B32,
+	S_BITSET0_B64,
+	S_BITSET1_B64,
 	S_MIN_I32,
 	S_MAX_I32,
 	S_MIN_U32,
@@ -108,6 +111,7 @@ enum class Opcode {
 	S_BFM_B64,
 	S_CSELECT_B32,
 	S_CSELECT_B64,
+	S_SETPRIO,
 	S_PACK_LL_B32_B16,
 	S_PACK_LH_B32_B16,
 	S_PACK_HH_B32_B16,
@@ -282,6 +286,7 @@ enum class Opcode {
 	V_MAD_MIXHI_F16,
 	V_ADD_NC_U32,
 	V_ADDC_U32,
+	V_SUB_CO_CI_U32,
 	V_SUBREV_CO_CI_U32,
 	V_SUB_NC_U32,
 	V_SUBREV_NC_U32,