openmp: Fix g++.dg/gomp/declare-target-3.C testcase when offloading is disabled

2020-12-18  Kwok Cheung Yeung  <kcy@codesourcery.com>

	gcc/testsuite/
	* g++.dg/gomp/declare-target-3.C: Only check .offload_var_table
	entries if offloading is enabled.

gcc/testsuite/g++.dg/gomp/declare-target-3.C

@@ -22,10 +22,10 @@ int *g = &f;	// Explicitly marked
 // { dg-final { scan-tree-dump "__attribute__\\\(\\\(omp declare target\\\)\\\)\\\nint bar \\\(\\\)" "gimple" } }
 // { dg-final { scan-tree-dump "__attribute__\\\(\\\(omp declare target\\\)\\\)\\\nint baz \\\(\\\)" "gimple" } }
 // { dg-final { scan-tree-dump "__attribute__\\\(\\\(omp declare target\\\)\\\)\\\nint qux \\\(\\\)" "gimple" } }
-// { dg-final { scan-assembler-not "\\\.offload_var_table:\\n.+\\\.quad\\s+a" } }
-// { dg-final { scan-assembler "\\\.offload_var_table:\\n.+\\\.quad\\s+b" } }
-// { dg-final { scan-assembler "\\\.offload_var_table:\\n.+\\\.quad\\s+c" } }
-// { dg-final { scan-assembler "\\\.offload_var_table:\\n.+\\\.quad\\s+d" } }
-// { dg-final { scan-assembler "\\\.offload_var_table:\\n.+\\\.quad\\s+e" } }
-// { dg-final { scan-assembler "\\\.offload_var_table:\\n.+\\\.quad\\s+f" } }
-// { dg-final { scan-assembler "\\\.offload_var_table:\\n.+\\\.quad\\s+g" } }
+// { dg-final { scan-assembler-not "\\\.offload_var_table:\\n.+\\\.quad\\s+a" { target { offloading_enabled } } } }
+// { dg-final { scan-assembler "\\\.offload_var_table:\\n.+\\\.quad\\s+b" { target { offloading_enabled } } } }
+// { dg-final { scan-assembler "\\\.offload_var_table:\\n.+\\\.quad\\s+c" { target { offloading_enabled } } } }
+// { dg-final { scan-assembler "\\\.offload_var_table:\\n.+\\\.quad\\s+d" { target { offloading_enabled } } } }
+// { dg-final { scan-assembler "\\\.offload_var_table:\\n.+\\\.quad\\s+e" { target { offloading_enabled } } } }
+// { dg-final { scan-assembler "\\\.offload_var_table:\\n.+\\\.quad\\s+f" { target { offloading_enabled } } } }
+// { dg-final { scan-assembler "\\\.offload_var_table:\\n.+\\\.quad\\s+g" { target { offloading_enabled } } } }