Make fast_exp take an Isolate* paramter

src/ia32/codegen-ia32.cc

Index: src/ia32/codegen-ia32.cc
diff --git a/src/ia32/codegen-ia32.cc b/src/ia32/codegen-ia32.cc
index 93f4cee636698567805955e11b33eba0336358f4..8e068f6a7e6d84f59722228c73bcc9a9be066fbd 100644
--- a/src/ia32/codegen-ia32.cc
+++ b/src/ia32/codegen-ia32.cc
@@ -34,15 +34,14 @@ void StubRuntimeCallHelper::AfterCall(MacroAssembler* masm) const {
 #define __ masm.
 
 
-UnaryMathFunction CreateExpFunction() {
-  if (!FLAG_fast_math) return &std::exp;
+UnaryMathFunctionWithIsolate CreateExpFunction(Isolate* isolate) {
   size_t actual_size;
   byte* buffer =
       static_cast<byte*>(base::OS::Allocate(1 * KB, &actual_size, true));
-  if (buffer == NULL) return &std::exp;
+  if (buffer == nullptr) return nullptr;
   ExternalReference::InitializeMathExpData();
 
-  MacroAssembler masm(NULL, buffer, static_cast<int>(actual_size));
+  MacroAssembler masm(nullptr, buffer, static_cast<int>(actual_size));
   // esp[1 * kPointerSize]: raw double input
   // esp[0 * kPointerSize]: return address
   {
@@ -65,9 +64,9 @@ UnaryMathFunction CreateExpFunction() {
   masm.GetCode(&desc);
   DCHECK(!RelocInfo::RequiresRelocation(desc));
 
-  Assembler::FlushICacheWithoutIsolate(buffer, actual_size);
+  Assembler::FlushICache(isolate, buffer, actual_size);
   base::OS::ProtectCode(buffer, actual_size);
-  return FUNCTION_CAST<UnaryMathFunction>(buffer);
+  return FUNCTION_CAST<UnaryMathFunctionWithIsolate>(buffer);
 }