Add new Release configuration Swift wholemodule optimization flag.

Configurations/Project/Release.xcconfig

@@ -19,6 +19,7 @@ VALIDATE_PRODUCT = YES
 // Optimization
 GCC_OPTIMIZATION_LEVEL = s
 SWIFT_OPTIMIZATION_LEVEL = -Owholemodule
+SWIFT_COMPILATION_MODE = wholemodule
 
 // Preprocessor
 ENABLE_NS_ASSERTIONS = NO