Added an XFAIL test case for critical construct name collision

Author: NimishMishra

flang/test/Semantics/critical05.f90

@@ -0,0 +1,18 @@
+! RUN: %python %S/test_symbols.py %s %flang_fc1 -fopenmp
+! XFAIL: *
+!Checking for name collision of a critical construct with other elements of a program
+
+!DEF: /check_symbols MainProgram
+program check_symbols
+    !DEF: /check_symbols/i ObjectEntity INTEGER(4)
+    integer i, bar 
+    !REF: /check_symbols/i
+    foo: do i = 1, 10 
+    end do foo
+    
+    !$omp critical (foo)
+    !$omp end critical (foo)
+
+    !$omp critical (bar)
+    !$omp end critical (bar)
+end program check_symbols