[CFI] Refactor test use to use GeneratedCode

Replace direct call to generated code with call using GeneratedCode to
match the rest of v8.

BUG=v8:7164

Change-Id: I3e45d3e7c45f06fc362a22217ee7f0f1b70745e2
Reviewed-on: https://chromium-review.googlesource.com/1002534
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52536}

test/cctest/test-code-stubs.cc

@@ -37,6 +37,7 @@
 #include "src/heap/factory.h"
 #include "src/macro-assembler.h"
 #include "src/objects-inl.h"
+#include "src/simulator.h"
 #include "test/cctest/cctest.h"
 #include "test/cctest/test-code-stubs.h"
 
@@ -97,7 +98,17 @@ void RunOneTruncationTestWithTest(ConvertDToICallWrapper callWrapper,
 
 int32_t DefaultCallWrapper(ConvertDToIFunc func,
                            double from) {
-  return (*func)(from);
+  if (func == &ConvertDToICVersion) return (*func)(from);
+
+#ifdef USE_SIMULATOR
+  // Simulator users will require a custom 'RunGeneratedCodeCallWrapper' to
+  // account for platform-specific floating point calling conventions.
+  UNREACHABLE();
+#else
+  auto f =
+      GeneratedCode<int32_t(double)>::FromAddress(CcTest::i_isolate(), func);
+  return f.Call(from);
+#endif
 }