[clang] [flang] [llvm] [openmp] [Flang][OpenMP] Move builtin .mod generation into runtimes (PR #137828)

[Kelvin Li via cfe-commits]

kkwli wrote:

I encounter the following issue when building flang-rt.
```
[29/50] Building Fortran object 
flang-rt/...lang_rt.runtime.dir/ieee_arithmetic.f90.
FAILED: 
flang-rt/lib/runtime/CMakeFiles/obj.flang_rt.runtime.dir/ieee_arithmetic.f90.o 
lib/clang/22/finclude/powerpc64le-unknown-linux-gnu/ieee_arithmetic.mod 
/scratch/kli/wrk/f/build-flang-local/bin/flang 
-I/scratch/kli/llvm-project/flang-rt/lib/runtime 
-I/scratch/kli/llvm-project/flang-rt/include 
-I/scratch/kli/llvm-project/flang-rt/../flang/include 
-I/scratch/kli/wrk/f/build-flang-rt-local-standalone/flang-rt 
-module-dirlib/clang/22/finclude/powerpc64le-unknown-linux-gnu -fPIC -mmlir 
-ignore-missing-type-desc -Xflang -fno-reformat -fno-lto 
"-D_GLIBCXX_THROW_OR_ABORT(_EXC)=(__builtin_abort())" 
-fintrinsic-modules-path=/scratch/kli/wrk/f/build-flang-rt-local-standalone/lib/clang/22/finclude/powerpc64le-unknown-linux-gnu
 -ffixed-line-length-72 -c 
flang-rt/lib/runtime/CMakeFiles/obj.flang_rt.runtime.dir/ieee_arithmetic.f90-pp.f90
 -o 
flang-rt/lib/runtime/CMakeFiles/obj.flang_rt.runtime.dir/ieee_arithmetic.f90.o
error: Semantic errors in 
flang-rt/lib/runtime/CMakeFiles/obj.flang_rt.runtime.dir/ieee_arithmetic.f90-pp.f90
./flang-rt/lib/runtime/CMakeFiles/obj.flang_rt.runtime.dir/ieee_arithmetic.f90-pp.f90:117:51:
 error: REAL(KIND=10) is not an enabled type for this target
  elemental logical function ieee_is_finite_a10(x); real(10), intent(in) :: x;
                                                    ^^^^^^^^^^^^^^^^^^^^^^^^^
[47/50] Building CXX object 
flang-rt/lib/....flang_rt.runtime.dir/descriptor-io.cpp.
ninja: build stopped: subcommand failed.

```

https://github.com/llvm/llvm-project/pull/137828
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