[ADT] Make DenseMap/DenseSet more resilient agains OOM situations

Author: marcauberer

llvm/cmake/modules/LLVMConfig.cmake.in

@@ -47,6 +47,9 @@ set(LLVM_ENABLE_EXPENSIVE_CHECKS @LLVM_ENABLE_EXPENSIVE_CHECKS@)
 set(LLVM_ENABLE_ASSERTIONS @LLVM_ENABLE_ASSERTIONS@)
 
 set(LLVM_ENABLE_EH @LLVM_ENABLE_EH@)
+if(LLVM_ENABLE_EH)
+  add_definitions(-DLLVM_EH_ENABLED)
+endif()
 
 set(LLVM_ENABLE_FFI @LLVM_ENABLE_FFI@)
 if(LLVM_ENABLE_FFI)