[builtins] Introduce proper base::ieee754::log.

src/crankshaft/s390/lithium-codegen-s390.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/crankshaft/s390/lithium-codegen-s390.h"
 
 #include "src/base/bits.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
@@ skipping 3667 matching lines @@
   Register temp1 = ToRegister(instr->temp1());
   Register temp2 = ToRegister(instr->temp2());
 
   MathExpGenerator::EmitMathExp(masm(), input, result, double_scratch1,
                                 double_scratch2, temp1, temp2, scratch0());
 }
 
 void LCodeGen::DoMathLog(LMathLog* instr) {
   __ PrepareCallCFunction(0, 1, scratch0());
   __ MovToFloatParameter(ToDoubleRegister(instr->value()));
-  __ CallCFunction(ExternalReference::math_log_double_function(isolate()), 0,
-                   1);
+  __ CallCFunction(ExternalReference::ieee754_log_function(isolate()), 0, 1);
   __ MovFromFloatResult(ToDoubleRegister(instr->result()));
 }
 
 void LCodeGen::DoMathClz32(LMathClz32* instr) {
   Register input = ToRegister(instr->value());
   Register result = ToRegister(instr->result());
   Label done;
   __ llgfr(result, input);
   __ flogr(r0, result);
   __ LoadRR(result, r0);
@@ skipping 2002 matching lines @@
   __ LoadP(result,
            FieldMemOperand(scratch, FixedArray::kHeaderSize - kPointerSize));
   __ bind(deferred->exit());
   __ bind(&done);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8