Index: lib/Target/WebAssembly/WebAssemblyFixFunctionBitcasts.cpp
===================================================================
--- lib/Target/WebAssembly/WebAssemblyFixFunctionBitcasts.cpp
+++ lib/Target/WebAssembly/WebAssemblyFixFunctionBitcasts.cpp
@@ -149,10 +149,7 @@
     if (!Wrapper)
       continue;
 
-    if (isa<Constant>(U->get()))
-      U->get()->replaceAllUsesWith(Wrapper);
-    else
-      U->set(Wrapper);
+    U->set(Wrapper);
   }
 
   return true;
Index: test/CodeGen/WebAssembly/function-bitcasts.ll
===================================================================
--- test/CodeGen/WebAssembly/function-bitcasts.ll
+++ test/CodeGen/WebAssembly/function-bitcasts.ll
@@ -47,10 +47,16 @@
 define void @test() {
 entry:
   call void bitcast (void (i32)* @has_i32_arg to void ()*)()
+  call void bitcast (void (i32)* @has_i32_arg to void ()*)()
   call void bitcast (i32 ()* @has_i32_ret to void ()*)()
   call void bitcast (void ()* @foo0 to void (i32)*)(i32 0)
+  %p = bitcast void ()* @foo0 to void (i32)*
+  call void %p(i32 0)
+  %q = bitcast void ()* @foo0 to void (i32)*
+  call void %q(i32 0)
   %t = call i32 bitcast (void ()* @foo1 to i32 ()*)()
   call void bitcast (void ()* @foo2 to void ()*)()
   call void @foo3()
+
   ret void
 }