[OpenMP][NVPTX] Disable OpenMPOpt when building deviceRTLs

We build `deviceRTLs` with `-O1` by default, which also triggers OpenMPOpt. When
the info cache is created, some attributes are removed. As a result, although we
mark a few functions `noinline`, they are still inlined when the bitcode library
is generated. This can cause an issue in middle end optimization.

Reviewed By: jdoerfert

Differential Revision: https://reviews.llvm.org/D106710

openmp/libomptarget/deviceRTLs/nvptx/CMakeLists.txt

@@ -153,7 +153,7 @@ set(cuda_src_files
 
 # Set flags for LLVM Bitcode compilation.
 set(bc_flags -S -x c++ -O1 -std=c++14
-             -mllvm -openmp-opt-disable-internalization
+             -mllvm -openmp-opt-disable
              -target nvptx64
              -Xclang -emit-llvm-bc
              -Xclang -aux-triple -Xclang ${aux_triple}