Use optimize for size

Author: noahsmartin

Sources/Configuration/SDK.xcconfig

@@ -177,9 +177,9 @@ SWIFT_COMPILATION_MODE = $(SWIFT_COMPILATION_MODE_$(CONFIGURATION))
 SWIFT_OPTIMIZATION_LEVEL_Debug = -Onone
 SWIFT_OPTIMIZATION_LEVEL_DebugV9 = -Onone
 SWIFT_OPTIMIZATION_LEVEL_DebugWithoutUIKit = -Onone
-SWIFT_OPTIMIZATION_LEVEL_Release = -O
-SWIFT_OPTIMIZATION_LEVEL_ReleaseV9 = -O
-SWIFT_OPTIMIZATION_LEVEL_ReleaseWithoutUIKit = -O
+SWIFT_OPTIMIZATION_LEVEL_Release = -Osize
+SWIFT_OPTIMIZATION_LEVEL_ReleaseV9 = -Osize
+SWIFT_OPTIMIZATION_LEVEL_ReleaseWithoutUIKit = -Osize
 SWIFT_OPTIMIZATION_LEVEL_Test = -Onone
 SWIFT_OPTIMIZATION_LEVEL_TestCI = -Onone
 SWIFT_OPTIMIZATION_LEVEL = $(SWIFT_OPTIMIZATION_LEVEL_$(CONFIGURATION))