[GN] Add support for disabling opts via SK_BUILD_NO_OPTS define.

experimental/iOSSampleApp/iOSSampleApp.xcodeproj/project.pbxproj

 // !$*UTF8*$!
 {
         archiveVersion = 1;
         classes = {
         };
         objectVersion = 46;
         objects = {
 
 /* Begin PBXBuildFile section */
                 1DF5F4E00D08C38300B7A737 /* UIKit.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 1DF5F4DF0D08C38300B7A737 /* UIKit.framework */; };
@@ skipping 3410 matching lines @@
                 C01FCF4F08A954540054247B /* Debug */ = {
                         isa = XCBuildConfiguration;
                         baseConfigurationReference = 2662AB6F13BD067900CDE7E9 /* SkiOSSampleApp-Debug.xcconfig */;
                         buildSettings = {
                                 ARCHS = "$(ARCHS_UNIVERSAL_IPHONE_OS)";
                                 "CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
                                 GCC_C_LANGUAGE_STANDARD = c99;
                                 GCC_OPTIMIZATION_LEVEL = 0;
                                 GCC_PREPROCESSOR_DEFINITIONS = (
                                         SK_BUILD_FOR_IOS,
+                                        SK_BUILD_NO_OPTS,
                                         SK_DEBUG,
                                 );
                                 GCC_WARN_ABOUT_RETURN_TYPE = YES;
                                 GCC_WARN_UNUSED_VARIABLE = NO;
                                 PREBINDING = NO;
                                 SDKROOT = iphoneos;
                                 TARGETED_DEVICE_FAMILY = "1,2";
                                 USER_HEADER_SEARCH_PATHS = "../../gpu/include/** ../../include/**";
                         };
                         name = Debug;
                 };
                 C01FCF5008A954540054247B /* Release */ = {
                         isa = XCBuildConfiguration;
                         baseConfigurationReference = 2662AB7513BD0C0D00CDE7E9 /* SkiOSSampleApp-Release.xcconfig */;
                         buildSettings = {
                                 ARCHS = "$(ARCHS_STANDARD_32_BIT)";
                                 "CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
                                 GCC_C_LANGUAGE_STANDARD = c99;
                                 GCC_PREPROCESSOR_DEFINITIONS = (
                                         SK_RELEASE,
                                         SK_BUILD_FOR_IOS,
+                                        SK_BUILD_NO_OPTS,
                                 );
                                 GCC_WARN_ABOUT_RETURN_TYPE = YES;
                                 GCC_WARN_UNUSED_VARIABLE = NO;
                                 IPHONEOS_DEPLOYMENT_TARGET = 4.2;
                                 OTHER_CFLAGS = "-DNS_BLOCK_ASSERTIONS=1";
                                 PREBINDING = NO;
                                 SDKROOT = iphoneos4.3;
                                 TARGETED_DEVICE_FAMILY = "1,2";
                         };
                         name = Release;
@@ skipping 16 matching lines @@
                                 C01FCF4F08A954540054247B /* Debug */,
                                 C01FCF5008A954540054247B /* Release */,
                         );
                         defaultConfigurationIsVisible = 0;
                         defaultConfigurationName = Release;
                 };
 /* End XCConfigurationList section */
         };
         rootObject = 29B97313FDCFA39411CA2CEA /* Project object */;
 }