[profile] Move test into Posix

Fix Windows after #102940

Author: vitalybuka

compiler-rt/test/profile/instrprof-fork.c renamed to compiler-rt/test/profile/Posix/instrprof-fork.c

@@ -15,7 +15,8 @@
 __attribute__((noinline)) void func1() {}
 __attribute__((noinline)) void func2() {}
 
-int main(void) {      //   child     | parent
+int main(void) {
+  //                       child     | parent
   int status;         // func1 func2 | func1 func2
   func1();            //   +1        |   +1        (*)
   pid_t pid = fork(); //             |
@@ -27,4 +28,5 @@ int main(void) {      //   child     | parent
   if (pid)            // ------------+------------
     wait(&status);    //    2     1  |    2    0
   return 0;           // (*)  the child inherits counter values prior to fork
-}                     //      from the parent in non-continuous mode.
+                      //      from the parent in non-continuous mode.
+}