Run constructors before resolving ifunc functions

Bug: 17177284

(cherry picked from commit 9598b8c415)

Change-Id: I2c9631ee1cd77f8cf95ec0216a35b605c8786454

tests/libs/dlopen_testlib_ifunc.c

@@ -17,7 +17,22 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+static int g_flag = 0;
+
+static void __attribute__((constructor)) init_flag() {
+  g_flag = 1;
+}
+
 const char* foo() __attribute__ ((ifunc ("foo_ifunc")));
+const char* is_ctor_called() __attribute__ ((ifunc("is_ctor_called_ifun")));
+
+const char* return_true() {
+  return "true";
+}
+
+const char* return_false() {
+  return "false";
+}
 
 const char* f1() {
   return "unset";
@@ -27,6 +42,10 @@ const char* f2() {
   return "set";
 }
 
+void* is_ctor_called_ifun() {
+  return g_flag == 0 ? return_false : return_true;
+}
+
 void* foo_ifunc() {
    char* choice = getenv("IFUNC_CHOICE");
    return choice == NULL ? f1 : f2;
@@ -34,4 +53,4 @@ void* foo_ifunc() {
 
 const char* foo_library() {
    return foo();
-}
+}