GlobalISel: legalize frem to a libcall on AArch64.

llvm-svn: 279988
diff --git a/llvm/lib/CodeGen/GlobalISel/MachineLegalizer.cpp b/llvm/lib/CodeGen/GlobalISel/MachineLegalizer.cpp
index c6ee362..11b04f4 100644
--- a/llvm/lib/CodeGen/GlobalISel/MachineLegalizer.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/MachineLegalizer.cpp
@@ -127,6 +127,7 @@
     llvm_unreachable("Cannot find legal type");
   case Legal:
   case Lower:
+  case Libcall:
     return Aspect.Type;
   case NarrowScalar: {
     return findLegalType(Aspect,