Remove broken %_Log functionality.

src/arm64/macro-assembler-arm64.cc

 // Copyright 2013 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 "v8.h"
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "bootstrapper.h"
 #include "codegen.h"
@@ skipping 1597 matching lines @@
 
 
 void MacroAssembler::CallRuntime(const Runtime::Function* f,
                                  int num_arguments,
                                  SaveFPRegsMode save_doubles) {
   // All arguments must be on the stack before this function is called.
   // x0 holds the return value after the call.
 
   // Check that the number of arguments matches what the function expects.
   // If f->nargs is -1, the function can accept a variable number of arguments.
-  if (f->nargs >= 0 && f->nargs != num_arguments) {
-    // Illegal operation: drop the stack arguments and return undefined.
-    if (num_arguments > 0) {
-      Drop(num_arguments);
-    }
-    LoadRoot(x0, Heap::kUndefinedValueRootIndex);
-    return;
-  }
+  CHECK(f->nargs < 0 || f->nargs == num_arguments);
 
   // Place the necessary arguments.
   Mov(x0, num_arguments);
   Mov(x1, ExternalReference(f, isolate()));
 
   CEntryStub stub(isolate(), 1, save_doubles);
   CallStub(&stub);
 }
 
 
@@ skipping 3579 matching lines @@
   }
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM64