shader: decode S_FLBIT_I32 and S_FLBIT_I32_I64 with a 4-op signed leading-bit search

src/graphics/shader/recompiler/frontend/decode/ScalarAluOps.cpp

@@ -57,6 +57,8 @@ constexpr OpcodeMap SOP1_OPCODE_LIST[] = {
     {0x14u, Opcode::S_FF1_I32_B64},
     {0x15u, Opcode::S_FLBIT_I32_B32},
     {0x16u, Opcode::S_FLBIT_I32_B64},
+    {0x17u, Opcode::S_FLBIT_I32},
+    {0x18u, Opcode::S_FLBIT_I32_I64},
     {0x19u, Opcode::S_SEXT_I32_I8},
     {0x1au, Opcode::S_SEXT_I32_I16},
     {0x1bu, Opcode::S_BITSET0_B32},