Index: include/llvm/Analysis/TargetTransformInfoImpl.h
===================================================================
--- include/llvm/Analysis/TargetTransformInfoImpl.h
+++ include/llvm/Analysis/TargetTransformInfoImpl.h
@@ -152,6 +152,15 @@
     case Intrinsic::var_annotation:
     case Intrinsic::experimental_gc_result:
     case Intrinsic::experimental_gc_relocate:
+    case Intrinsic::coro_alloc:
+    case Intrinsic::coro_begin:
+    case Intrinsic::coro_free:
+    case Intrinsic::coro_end:
+    case Intrinsic::coro_frame:
+    case Intrinsic::coro_size:
+    case Intrinsic::coro_suspend:
+    case Intrinsic::coro_param:
+    case Intrinsic::coro_subfn_addr:
       // These intrinsics don't actually represent code after lowering.
       return TTI::TCC_Free;
     }
Index: include/llvm/IR/Intrinsics.td
===================================================================
--- include/llvm/IR/Intrinsics.td
+++ include/llvm/IR/Intrinsics.td
@@ -597,7 +597,43 @@
                                 [llvm_token_ty, llvm_i32_ty, llvm_i32_ty],
                                 [IntrReadMem]>;
 
-//===-------------------------- Other Intrinsics --------------------------===//
+//===------------------------ Coroutine Intrinsics ---------------===//
+// These are documented in docs/Coroutines.rst
+
+// Coroutine Structure Intrinsics.
+
+def int_coro_alloc : Intrinsic<[llvm_ptr_ty], [], [IntrNoMem]>;
+def int_coro_begin : Intrinsic<[llvm_ptr_ty], [llvm_ptr_ty, llvm_i32_ty,
+                                llvm_ptr_ty, llvm_ptr_ty], []>;
+
+def int_coro_free : Intrinsic<[llvm_ptr_ty], [llvm_ptr_ty], [IntrNoMem]>;
+def int_coro_end : Intrinsic<[], [llvm_ptr_ty, llvm_i1_ty], []>;
+
+def int_coro_frame : Intrinsic<[llvm_ptr_ty], [], [IntrNoMem]>;
+def int_coro_size : Intrinsic<[llvm_anyint_ty], [], [IntrNoMem]>;
+
+def int_coro_save : Intrinsic<[llvm_token_ty], [llvm_ptr_ty], []>;
+def int_coro_suspend : Intrinsic<[llvm_i8_ty], [llvm_token_ty, llvm_i1_ty], []>;
+
+def int_coro_param : Intrinsic<[llvm_i1_ty], [llvm_ptr_ty, llvm_ptr_ty],
+                               [IntrReadMem, ReadNone<0>, NoCapture<0>,
+                                ReadNone<1>,NoCapture<1>]>;
+
+// Coroutine Manipulation Intrinsics.
+
+def int_coro_resume : Intrinsic<[], [llvm_ptr_ty], [Throws]>;
+def int_coro_destroy : Intrinsic<[], [llvm_ptr_ty], [Throws]>;
+def int_coro_done : Intrinsic<[llvm_i1_ty], [llvm_ptr_ty], [IntrReadMem]>;
+def int_coro_promise : Intrinsic<[llvm_ptr_ty],
+                                 [llvm_ptr_ty, llvm_i32_ty, llvm_i1_ty],
+                                 [IntrNoMem]>;
+
+// Coroutine Lowering Intrinsics. Used internally by coroutine passes.
+
+def int_coro_subfn_addr : Intrinsic<[llvm_ptr_ty], [llvm_ptr_ty, llvm_i8_ty],
+                                    [IntrReadMem]>;
+
+///===-------------------------- Other Intrinsics --------------------------===//
 //
 def int_flt_rounds : Intrinsic<[llvm_i32_ty]>,
                      GCCBuiltin<"__builtin_flt_rounds">;