[llvm] r318275 - GISelWorkList.h: Fix -fmodules build in rL318210.

[NAKAMURA Takumi via llvm-commits]

Author: chapuni
Date: Tue Nov 14 23:34:35 2017
New Revision: 318275

URL: http://llvm.org/viewvc/llvm-project?rev=318275&view=rev
Log:
GISelWorkList.h: Fix -fmodules build in rL318210.

Modified:
    llvm/trunk/include/llvm/CodeGen/GlobalISel/GISelWorkList.h

Modified: llvm/trunk/include/llvm/CodeGen/GlobalISel/GISelWorkList.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/CodeGen/GlobalISel/GISelWorkList.h?rev=318275&r1=318274&r2=318275&view=diff
==============================================================================
--- llvm/trunk/include/llvm/CodeGen/GlobalISel/GISelWorkList.h (original)
+++ llvm/trunk/include/llvm/CodeGen/GlobalISel/GISelWorkList.h Tue Nov 14 23:34:35 2017
@@ -16,6 +16,8 @@
 
 namespace llvm {
 
+class MachineInstr;
+
 // Worklist which mostly works similar to InstCombineWorkList, but on MachineInstrs.
 // The main difference with something like a SetVector is that erasing an element doesn't
 // move all elements over one place - instead just nulls out the element of the vector.