[Libomptarget] Make plugins depend explicitly on `intrinsics_gen`

Summary:
It's possible for the OpenMP offloading plugins to be build before
tablegen is run despite the fact that we rely on it. Simply make it
depend on it currently.
GitOrigin-RevId: 9f0321ccf118b37e5cb93cabd2acbf600c36b6ee
diff --git a/libomptarget/plugins-nextgen/common/CMakeLists.txt b/libomptarget/plugins-nextgen/common/CMakeLists.txt
index b84f3d7..a7350e6 100644
--- a/libomptarget/plugins-nextgen/common/CMakeLists.txt
+++ b/libomptarget/plugins-nextgen/common/CMakeLists.txt
@@ -19,6 +19,7 @@
   src/RPC.cpp
   src/Utils/ELF.cpp
 )
+add_dependencies(PluginCommon intrinsics_gen)
 
 # Only enable JIT for those targets that LLVM can support.
 string(TOUPPER "${LLVM_TARGETS_TO_BUILD}" TargetsSupported)