[FLANG][OPENMP] Fix handling of continuation lines in mixed OpenMP and Fortran free-form

Author: Karthikdhondi

flang/test/Parser/cd_continuation.f90

@@ -0,0 +1,61 @@
+! RUN: flang-new -fopenmp -E %s 2>&1 | FileCheck %s --check-prefix=CHECK-OMP
+! RUN: flang-new -E %s 2>&1 | FileCheck %s 
+
+
+! Test in mixed way, i.e., combination of Fortran free source form 
+! and free source form with conditional compilation sentinel.
+! CHECK-LABEL: subroutine mixed_form1()
+! CHECK-OMP: i = 1 +100+ 1000+ 10 + 1 +1000000000 + 1000000
+! CHECK: i = 1 + 10 + 10000 + 1000000
+subroutine mixed_form1()
+   i = 1 &
+  !$+100&
+  !$&+ 1000&
+   &+ 10 + 1&
+  !$& +100000&
+   &0000 + 1000000
+end subroutine	
+
+
+
+! CHECK-LABEL: subroutine mixed_form2()
+! CHECK-OMP: i = 0
+! CHECK-OMP: i = 1 +100+ 1000+ 10 + 1 +1000000000 + 1000000
+! CHECK: i = 1 + 10 + 10000 + 1000000
+subroutine mixed_form2()
+!$ i = 0
+   i = 1 &
+  !$+100&
+  !$&+ 1000&
+   &+ 10 + 1&
+  !$& +100000&
+   & 0000 + 1000000
+
+end subroutine
+
+
+! Testing continuation lines in only Fortran Free form Source
+! CHECK-LABEL: subroutine mixed_form3()
+! CHECK-OMP: i = 1 +10 +100+ 1000 + 10000
+! CHECK: i = 1 +10 +100+ 1000 + 10000
+subroutine mixed_form3()
+   i = 1 &
+   +10 &
+   &+100
+   & + 1000 &
+   + 10000
+end subroutine
+
+
+! Testing continuation line in only free source form conditional compilation sentinel.
+! CHECK-LABEL: subroutine mixed_form4()
+! CHECK-OMP: i=0
+! CHECK-OMP: i = 1 +10 +100+1000
+subroutine mixed_form4()
+   !$ i=0
+   !$ i = 1 &
+   !$ & +10 &
+   !$&+100&
+   !$ +1000 
+end subroutine
+