Add header guard and mark the function extern "C".

This function may be called from the C++ land, so mark it extern "C".

Change-Id: Ic9611e78c997fb8f2a1d085982f431107f3c44e2

Author: yaoyuannnn

profile-func/trace_logger_aladdin.h

@@ -1 +1,14 @@
-void llvmtracer_set_trace_name(char *trace_name);
+#ifndef __LLVM_TRACER_TRACE_LOGGER_ALADDIN_H__
+#define __LLVM_TRACER_TRACE_LOGGER_ALADDIN_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void llvmtracer_set_trace_name(const char *trace_name);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif