Fix builtin/runtime name clashes generated by macros

src/runtime.cc

 // Copyright 2012 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 <stdlib.h>
 #include <limits>
 
 #include "v8.h"
 
 #include "accessors.h"
@@ skipping 7773 matching lines @@
   HandleScope scope(isolate);                                                  \
   ASSERT(args.length() == 1);                                                  \
   isolate->counters()->math_##name()->Increment();                             \
   CONVERT_DOUBLE_ARG_CHECKED(x, 0);                                            \
   return *isolate->factory()->NewHeapNumber(std::name(x));                     \
 }
 
 RUNTIME_UNARY_MATH(Acos, acos)
 RUNTIME_UNARY_MATH(Asin, asin)
 RUNTIME_UNARY_MATH(Atan, atan)
-RUNTIME_UNARY_MATH(Log, log)
+RUNTIME_UNARY_MATH(LogRT, log)
 #undef RUNTIME_UNARY_MATH
 
 
 RUNTIME_FUNCTION(Runtime_DoubleHi) {
   HandleScope scope(isolate);
   ASSERT(args.length() == 1);
   CONVERT_DOUBLE_ARG_CHECKED(x, 0);
   uint64_t integer = double_to_uint64(x);
   integer = (integer >> 32) & 0xFFFFFFFFu;
   return *isolate->factory()->NewNumber(static_cast<int32_t>(integer));
@@ skipping 7423 matching lines @@
   }
   return NULL;
 }
 
 
 const Runtime::Function* Runtime::FunctionForId(Runtime::FunctionId id) {
   return &(kIntrinsicFunctions[static_cast<int>(id)]);
 }
 
 } }  // namespace v8::internal