[compiler] Fix uncommon CompileOptimized fallback.

This fixes the uncommon fallback when Compiler::CompileOptimized fails
creating optimized code and also the underlying SharedFunctionInfo is
not compiled. We make sure not to uselessly regenerate the bytecode.

R=rmcilroy@chromium.org
BUG=chromium:639753

Review-Url: https://codereview.chromium.org/2261123002
Cr-Commit-Position: refs/heads/master@{#38776}

src/compiler.cc

@@ -1277,6 +1277,9 @@ bool Compiler::CompileOptimized(Handle<JSFunction> function,
     DCHECK(!isolate->has_pending_exception());
     if (function->shared()->is_compiled()) {
       code = handle(function->shared()->code(), isolate);
+    } else if (function->shared()->HasBytecodeArray()) {
+      code = isolate->builtins()->InterpreterEntryTrampoline();
+      function->shared()->ReplaceCode(*code);
     } else {
       Zone zone(isolate->allocator());
       ParseInfo parse_info(&zone, function);