Make fast_exp take an Isolate* paramter

src/crankshaft/hydrogen-instructions.cc

Index: src/crankshaft/hydrogen-instructions.cc
diff --git a/src/crankshaft/hydrogen-instructions.cc b/src/crankshaft/hydrogen-instructions.cc
index a782dae1135529d42abe1b2c0e63c15c6f739873..df1fb421e906a039680cdd5ddfeb1b1155c2a397 100644
--- a/src/crankshaft/hydrogen-instructions.cc
+++ b/src/crankshaft/hydrogen-instructions.cc
@@ -4080,7 +4080,8 @@ HInstruction* HUnaryMathOperation::New(Isolate* isolate, Zone* zone,
     }
     switch (op) {
       case kMathExp:
-        return H_CONSTANT_DOUBLE(fast_exp(d));
+        lazily_initialize_fast_exp(isolate);
+        return H_CONSTANT_DOUBLE(fast_exp(d, isolate));
       case kMathLog:
         return H_CONSTANT_DOUBLE(std::log(d));
       case kMathSqrt: