[arm64] Optimize fcmp when lhs operand is #0.0

src/compiler/ppc/code-generator-ppc.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/code-generator.h"
 
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/osr.h"
@@ skipping 169 matching lines @@
       return ne;
 #else
       return lt;
 #endif
     case kNotOverflow:
 #if V8_TARGET_ARCH_PPC64
       return eq;
 #else
       return ge;
 #endif
-    case kUnorderedEqual:
-    case kUnorderedNotEqual:
+    default:
       break;
   }
   UNREACHABLE();
   return kNoCondition;
 }
 
 }  // namespace
 
 #define ASSEMBLE_FLOAT_UNOP_RC(asm_instr)                            \
   do {                                                               \
@@ skipping 1432 matching lines @@
       padding_size -= v8::internal::Assembler::kInstrSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8