Fix -Wincomplete-umbrella warning in the modules build

[281/3666] Building CXX object lib/IR/CMakeFiles/LLVMCore.dir/IntrinsicInst.cpp.o
/Users/vsk/src/llvm-project-master/llvm/lib/IR/IntrinsicInst.cpp:155:2: warning: missing submodule 'LLVM_IR.ConstrainedOps' [-Wincomplete-umbrella]

llvm/include/llvm/module.modulemap

@@ -269,6 +269,7 @@ module LLVM_IR {
   module * { export * }
 
   // These are intended for (repeated) textual inclusion.
+  textual header "IR/ConstrainedOps.def"
   textual header "IR/DebugInfoFlags.def"
   textual header "IR/Instruction.def"
   textual header "IR/Metadata.def"