[MLIR] Mark application libraries as "BUILDTREE_ONLY"

[stephenneuendorffer]

Summary

These libraries are intended to be used as part of specific
applications (like mlir-opt). If they are both included in a single
library (e.g. libLLVM.so), then their options will collide, because
static initializers will be called more than once.

[mehdi_amini]

Isn't BUILDTREE_ONLY preventing from installing these library at all?
Some external projects may want to re-use them.

mlir/lib/Support/CMakeLists.txt

add_llvm_library(MLIRSupport
   StorageUniquer.cpp
   ToolUtilities.cpp
 
   ADDITIONAL_HEADER_DIRS
   ${MLIR_MAIN_INCLUDE_DIR}/mlir/Support
   )
 target_link_libraries(MLIRSupport LLVMSupport ${LLVM_PTHREAD_LIB})
 
-add_llvm_library(MLIROptMain
+add_llvm_library(MLIROptMain BUILDTREE_ONLY
   MlirOptMain.cpp
 
   ADDITIONAL_HEADER_DIRS
   ${MLIR_MAIN_INCLUDE_DIR}/mlir/Support
   )
 target_link_libraries(MLIROptMain
   MLIRPass
   LLVMSupport
   MLIRSupport
   )
 
 add_llvm_library(MLIRTranslateClParser
   TranslateClParser.cpp
 
   ADDITIONAL_HEADER_DIRS
   ${MLIR_MAIN_INCLUDE_DIR}/mlir/Support
   )
 target_link_libraries(MLIRTranslateClParser LLVMSupport)
 
-add_llvm_library(MLIRJitRunner
+add_llvm_library(MLIRJitRunner BUILDTREE_ONLY
   JitRunner.cpp
 )
 target_link_libraries(MLIRJitRunner PRIVATE
   MLIRExecutionEngine
   MLIRIR
   MLIRParser
   MLIRStandardOps
   MLIRTargetLLVMIR
   MLIRTransforms
   MLIRStandardToLLVM
   MLIRSupport
   LLVMCore
   LLVMSupport
 )

mlir/tools/mlir-opt/CMakeLists.txt

 set(LLVM_OPTIONAL_SOURCES
   null.cpp
 )
 
 set(LIB_LIBS
   MLIRAnalysis
   MLIRLLVMIR
   MLIRParser
   MLIRPass
   MLIRTransforms
   MLIRSupport
 )
-add_llvm_library(MLIRMlirOptLib
+add_llvm_library(MLIRMlirOptLib BUILDTREE_ONLY
   mlir-opt.cpp
 )
 target_link_libraries(MLIRMlirOptLib ${LIB_LIBS})
 
 set(LIBS
   MLIRAnalysis
   MLIRAffineOps
   MLIRAffineToStandard
list(APPEND LIBS
     MLIRGPUtoCUDATransforms
   )
 endif()
 add_llvm_tool(mlir-opt
  mlir-opt.cpp
 )
 llvm_update_compile_flags(mlir-opt)
 whole_archive_link(mlir-opt ${LIBS})
-target_link_libraries(mlir-opt PRIVATE MLIRIR MLIRMlirOptLib ${LIBS} LLVMSupport)
+target_link_libraries(mlir-opt PRIVATE MLIRIR MLIROptMain MLIRMlirOptLib ${LIBS} LLVMSupport)