Replace ExtractLane format with BinaryImm8

Like https://github.com/bytecodealliance/wasmtime/pull/1762, this change the name of the `ExtractLane` format to the more-general `BinaryImm8` and renames its immediate argument from `lane` to `imm`.

cranelift/codegen/src/isa/x86/enc_tables.rs

@@ -1195,10 +1195,10 @@ fn convert_extractlane(
     let mut pos = FuncCursor::new(func).at_inst(inst);
     pos.use_srcloc(inst);
 
-    if let ir::InstructionData::ExtractLane {
+    if let ir::InstructionData::BinaryImm8 {
         opcode: ir::Opcode::Extractlane,
         arg,
-        lane,
+        imm: lane,
     } = pos.func.dfg[inst]
     {
         // NOTE: the following legalization assumes that the upper bits of the XMM register do