Use optimize for size in size tests

Author: noahsmartin

Tests/Perf/test-app-sentry/test-app-sentry.xcodeproj/project.pbxproj

@@ -256,6 +256,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "match Development io.sentry.cocoa.perf-test-app-sentry";
 				SWIFT_EMIT_LOC_STRINGS = YES;
+				SWIFT_OPTIMIZATION_LEVEL = "-Osize";
 				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};