Index: llvm/lib/IR/Verifier.cpp
===================================================================
--- llvm/lib/IR/Verifier.cpp
+++ llvm/lib/IR/Verifier.cpp
@@ -3070,6 +3070,13 @@
   Function *Callee =
       dyn_cast<Function>(Call.getCalledOperand()->stripPointerCasts());
 
+  // TODO: This doesn't use isIntrinsic(), because some ObjCARC tests
+  // perform bitcasts on @llvm.objc.sendMsg intrinsics. Limit the check to
+  // intrinsics with an ID for now, as we already prevent taking their address.
+  if (Callee && Callee->getIntrinsicID())
+    Assert(Callee->getValueType() == FTy,
+           "Intrinsic called with incompatible signature", Call);
+
   if (Attrs.hasFnAttribute(Attribute::Speculatable)) {
     // Don't allow speculatable on call sites, unless the underlying function
     // declaration is also speculatable.
Index: llvm/test/Verifier/force-opaque-ptr.ll
===================================================================
--- /dev/null
+++ llvm/test/Verifier/force-opaque-ptr.ll
@@ -0,0 +1,9 @@
+; RUN: not opt -passes=verify -force-opaque-pointers -S < %s 2>&1 | FileCheck %s
+
+declare i32 @llvm.umax.i32(i32, i32)
+
+define void @intrinsic_signature_mismatch() {
+; CHECK: Intrinsic called with incompatible signature
+  call i32 @llvm.umax.i32(i32 0)
+  ret void
+}