[Flang] Missing diagnose on multiple proc-decl when Binding NAME= is present

[DanielCChen]

Consider the following code:

   interface
      subroutine foo() BIND(C)
      end subroutine
   end interface

   procedure(foo), BIND(C, NAME='myfptr') :: p1, p2, p3
   end

Flang currently compiles it successfully, but it violates the following constraint

C1520 (R1512) If proc-language-binding-spec with NAME= is specified, then proc-decl-list shall contain exactly
21 one proc-decl, which shall neither have the POINTER attribute nor be a dummy procedure.

[llvmbot]

@llvm/issue-subscribers-bug

Author: Daniel Chen (DanielCChen)

Consider the following code: ``` interface subroutine foo() BIND(C) end subroutine end interface

procedure(foo), BIND(C, NAME='myfptr') :: p1, p2, p3
end

Flang currently compiles it successfully, but it violates the following constraint 

C1520 (R1512) If proc-language-binding-spec with NAME= is specified, then proc-decl-list shall contain exactly
21 one proc-decl, which shall neither have the POINTER attribute nor be a dummy procedure.

</details>

[llvmbot]

@llvm/issue-subscribers-flang-frontend

Author: Daniel Chen (DanielCChen)

Consider the following code: ``` interface subroutine foo() BIND(C) end subroutine end interface

procedure(foo), BIND(C, NAME='myfptr') :: p1, p2, p3
end

Flang currently compiles it successfully, but it violates the following constraint 

C1520 (R1512) If proc-language-binding-spec with NAME= is specified, then proc-decl-list shall contain exactly
21 one proc-decl, which shall neither have the POINTER attribute nor be a dummy procedure.

</details>

[klausler]

#82842

[DanielCChen]

I have verified PR #82842 fixed the issue. Flang now issues

A procedure declaration statement with a binding name may not declare multiple procedures
     procedure(foo), BIND(C, NAME='myfptr') :: p1, p2, p3
     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Thanks for the quick fix! @klausler