Complete CrossSIMD non-simd fallback (although buggy, it seems). Minor ARM64 opt.

Core/Config.cpp

@@ -140,11 +140,22 @@ std::string DefaultLangRegion() {
 }
 
 static int DefaultDepthRaster() {
+
+// For 64-bit ARM and x86 with SIMD, enable depth raster.
+#if PPSSPP_ARCH(ARM64_NEON) || PPSSPP_ARCH(SSE2)
+
 #if PPSSPP_PLATFORM(ANDROID) || PPSSPP_PLATFORM(IOS)
 	return (int)DepthRasterMode::LOW_QUALITY;
 #else
 	return (int)DepthRasterMode::DEFAULT;
 #endif
+
+#else
+
+	// 32-bit ARM or no SIMD, the depth raster will be too slow.
+	return (int)DepthRasterMode::OFF;
+
+#endif
 }
 
 std::string CreateRandMAC() {