[OpenMP][libomptarget][NFC] Map test result with explicit upper bound extent

[doru1004]

Summary

Map test result with explicit upper bound extent. This is another attempt to find out why this test occasionally fails.

[doru1004]

Commit: f85369467cff35c9b12692f73b74fd109d3087b9

openmp/libomptarget/test/mapping/private_mapping.c

 // RUN: %libomptarget-compile-run-and-check-generic
 
 #include <assert.h>
 #include <stdio.h>
 
 int main() {
   int data1[3] = {1, 2, 5};
   int data2[3] = {10, 20, 50};
   int data3[3] = {100, 200, 500};
   int sum[16] = {0};
 
   for (int i=0; i<16; i++) sum[i] = 10000;
 
-#pragma omp target teams distribute parallel for map(tofrom : sum)             \
+#pragma omp target teams distribute parallel for map(tofrom : sum[:16])       \
     firstprivate(data1, data2, data3)
   for (int i = 0; i < 16; ++i) {
     for (int j = 0; j < 3; ++j) {
       sum[i] += data1[j];
       sum[i] += data2[j];
       sum[i] += data3[j];
     }
   }