sycl : Enhance to get the free memory of Intel GPU (#27968)

* enhance get mem info by l0 an SYCL API

* remove debug code, format the code

* update SYCL.md for GGML_SYCL_GET_MEM_API

ggml/src/ggml-sycl/base.hpp

@@ -0,0 +1,36 @@
+#ifndef GGML_SYCL_BASE_HPP
+#define GGML_SYCL_BASE_HPP
+
+/**
+ * Module: base
+ *
+ * Description:
+ * Provides zero-dependency, foundational primitives, core abstractions,
+ * and low-level system interfaces. This module acts as the lowest layer
+ * of the architecture and is consumed globally across all subsystems.
+ *
+ * Constraints:
+ * - STRICTLY zero upstream dependencies (leaf module).
+ * - High stability and backward compatibility required.
+ */
+
+#include <cstdio>
+
+extern int g_ggml_sycl_debug;
+
+#if defined(__clang__) && __has_builtin(__builtin_expect)
+// Hint the optimizer to pipeline the more likely following instruction in branches
+#    define LIKELY(expr)   __builtin_expect(expr, true)
+#    define UNLIKELY(expr) __builtin_expect(expr, false)
+#else
+#    define LIKELY(expr)   (expr)
+#    define UNLIKELY(expr) (expr)
+#endif
+
+#define GGML_SYCL_DEBUG(...)              \
+    do {                                  \
+        if (UNLIKELY(g_ggml_sycl_debug))  \
+            fprintf(stderr, __VA_ARGS__); \
+    } while (0)
+
+#endif  // GGML_SYCL_BASE_HPP