btrace: Use std::vector in struct btrace_thread_information.

gdb/btrace.h

@@ -34,6 +34,8 @@
 #  include <intel-pt.h>
 #endif
 
+#include <vector>
+
 struct thread_info;
 struct btrace_function;
 
@@ -187,9 +189,6 @@ struct btrace_function
   btrace_function_flags flags;
 };
 
-typedef struct btrace_function *btrace_fun_p;
-DEF_VEC_P (btrace_fun_p);
-
 /* A branch trace instruction iterator.  */
 struct btrace_insn_iterator
 {
@@ -342,7 +341,7 @@ struct btrace_thread_info
 
   /* Vector of pointer to decoded function segments.  These are in execution
      order with the first element == BEGIN and the last element == END.  */
-  VEC (btrace_fun_p) *functions;
+  std::vector<btrace_function *> functions;
 
   /* The function level offset.  When added to each function's LEVEL,
      this normalizes the function levels such that the smallest level