[wasm] Use the new Float64Atan(2) TF operators in wasm.

src/external-reference-table.cc

Index: src/external-reference-table.cc
diff --git a/src/external-reference-table.cc b/src/external-reference-table.cc
index d0aa08849b1a9127198f38f7efe8eaba2f5070db..5bbf69062dd3ff4bea203c82d5fc7b0436c90e82 100644
--- a/src/external-reference-table.cc
+++ b/src/external-reference-table.cc
@@ -154,8 +154,6 @@ ExternalReferenceTable::ExternalReferenceTable(Isolate* isolate) {
       "f64_acos_wrapper");
   Add(ExternalReference::f64_asin_wrapper_function(isolate).address(),
       "f64_asin_wrapper");
-  Add(ExternalReference::f64_atan_wrapper_function(isolate).address(),
-      "f64_atan_wrapper");
   Add(ExternalReference::f64_cos_wrapper_function(isolate).address(),
       "f64_cos_wrapper");
   Add(ExternalReference::f64_sin_wrapper_function(isolate).address(),
@@ -166,8 +164,6 @@ ExternalReferenceTable::ExternalReferenceTable(Isolate* isolate) {
       "f64_exp_wrapper");
   Add(ExternalReference::f64_pow_wrapper_function(isolate).address(),
       "f64_pow_wrapper");
-  Add(ExternalReference::f64_atan2_wrapper_function(isolate).address(),
-      "f64_atan2_wrapper");
   Add(ExternalReference::f64_mod_wrapper_function(isolate).address(),
       "f64_mod_wrapper");
   Add(ExternalReference::log_enter_external_function(isolate).address(),