[Flang][OpenMP] Skip implicit mapping of named constants (#145966)
Added early return when mapping named constants.
This prevents linking error in the following example:
```
program test
use, intrinsic :: iso_c_binding, only: c_double
implicit none
real(c_double) :: x
integer :: i
x = 0.0_c_double
!$omp target teams distribute parallel do reduction(+:x)
do i = 0, 9
x = x + 1.0_c_double
end do
!$omp end target teams distribute parallel do
end program test
```
Welcome to the LLVM project!
This repository contains the source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and run-time environments.
The LLVM project has multiple components. The core of the project is itself called “LLVM”. This contains all of the tools, libraries, and header files needed to process intermediate representations and convert them into object files. Tools include an assembler, disassembler, bitcode analyzer, and bitcode optimizer.
C-like languages use the Clang frontend. This component compiles C, C++, Objective-C, and Objective-C++ code into LLVM bitcode -- and from there into object files, using LLVM.
Other components include: the libc++ C++ standard library, the LLD linker, and more.
Consult the Getting Started with LLVM page for information on building and running LLVM.
For information on how to contribute to the LLVM project, please take a look at the Contributing to LLVM guide.
Join the LLVM Discourse forums, Discord chat, LLVM Office Hours or Regular sync-ups.
The LLVM project has adopted a code of conduct for participants to all modes of communication within the project.