[arm64] Optimize fcmp when lhs operand is #0.0

src/compiler/arm/code-generator-arm.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/arm/macro-assembler-arm.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 206 matching lines @@
     case kUnsignedGreaterThanOrEqual:
       return hs;
     case kUnsignedLessThanOrEqual:
       return ls;
     case kUnsignedGreaterThan:
       return hi;
     case kOverflow:
       return vs;
     case kNotOverflow:
       return vc;
-    case kUnorderedEqual:
-    case kUnorderedNotEqual:
+    default:
       break;
   }
   UNREACHABLE();
   return kNoCondition;
 }
 
 }  // namespace
 
 
 #define ASSEMBLE_CHECKED_LOAD_FLOAT(width)                           \
@@ skipping 1023 matching lines @@
       padding_size -= v8::internal::Assembler::kInstrSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8