Switched tvOS framework to BITCODE_GENERATION_MODE=marker for Debug builds.

Alamofire.xcodeproj/project.pbxproj

@@ -1051,7 +1051,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				APPLICATION_EXTENSION_API_ONLY = YES;
-				BITCODE_GENERATION_MODE = bitcode;
+				BITCODE_GENERATION_MODE = marker;
 				DEBUG_INFORMATION_FORMAT = dwarf;
 				DEFINES_MODULE = YES;
 				DYLIB_COMPATIBILITY_VERSION = 1;