[Liftoff] Cleanup unop macros

Merge CASE_I32_SIGN_EXTENSION with the identical CASE_I32_UNOP, and
rename CASE_I64_SIGN_EXTENSION to CASE_I64_UNOP. This prepares the
addition of more opcodes.

R=ahaas@chromium.org

Bug: v8:9919
Change-Id: Ie1611e2b937dffab221bfd9911e8b7f2350b9d19
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1889882Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64668}

src/wasm/baseline/liftoff-compiler.cc

@@ -742,14 +742,7 @@ class LiftoffCompiler {
           __ emit_##fn(dst.gp(), src.gp());             \
         });                                             \
     break;
-#define CASE_I32_SIGN_EXTENSION(opcode, fn)             \
-  case kExpr##opcode:                                   \
-    EmitUnOp<kWasmI32, kWasmI32>(                       \
-        [=](LiftoffRegister dst, LiftoffRegister src) { \
-          __ emit_##fn(dst.gp(), src.gp());             \
-        });                                             \
-    break;
-#define CASE_I64_SIGN_EXTENSION(opcode, fn)             \
+#define CASE_I64_UNOP(opcode, fn)                       \
   case kExpr##opcode:                                   \
     EmitUnOp<kWasmI64, kWasmI64>(                       \
         [=](LiftoffRegister dst, LiftoffRegister src) { \
@@ -823,11 +816,11 @@ class LiftoffCompiler {
                            &ExternalReference::wasm_uint64_to_float64, kNoTrap)
       CASE_TYPE_CONVERSION(F64ConvertF32, F64, F32, nullptr, kNoTrap)
       CASE_TYPE_CONVERSION(F64ReinterpretI64, F64, I64, nullptr, kNoTrap)
-      CASE_I32_SIGN_EXTENSION(I32SExtendI8, i32_signextend_i8)
-      CASE_I32_SIGN_EXTENSION(I32SExtendI16, i32_signextend_i16)
-      CASE_I64_SIGN_EXTENSION(I64SExtendI8, i64_signextend_i8)
-      CASE_I64_SIGN_EXTENSION(I64SExtendI16, i64_signextend_i16)
-      CASE_I64_SIGN_EXTENSION(I64SExtendI32, i64_signextend_i32)
+      CASE_I32_UNOP(I32SExtendI8, i32_signextend_i8)
+      CASE_I32_UNOP(I32SExtendI16, i32_signextend_i16)
+      CASE_I64_UNOP(I64SExtendI8, i64_signextend_i8)
+      CASE_I64_UNOP(I64SExtendI16, i64_signextend_i16)
+      CASE_I64_UNOP(I64SExtendI32, i64_signextend_i32)
       case kExprI32Eqz:
         DCHECK(decoder->lookahead(0, kExprI32Eqz));
         if (decoder->lookahead(1, kExprBrIf)) {
@@ -869,8 +862,7 @@ class LiftoffCompiler {
         UNREACHABLE();
     }
 #undef CASE_I32_UNOP
-#undef CASE_I32_SIGN_EXTENSION
-#undef CASE_I64_SIGN_EXTENSION
+#undef CASE_I64_UNOP
 #undef CASE_FLOAT_UNOP
 #undef CASE_FLOAT_UNOP_WITH_CFALLBACK
 #undef CASE_TYPE_CONVERSION