[GlobalISel] Add IRTranslator support for G_FRINT

Add it as a simple intrinsic, update arm64-irtranslator.ll.

Differential Revision: https://reviews.llvm.org/D60893

llvm-svn: 358787
diff --git a/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp b/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
index 308105f..0182352 100644
--- a/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
@@ -790,6 +790,8 @@
       return TargetOpcode::G_FLOG10;
     case Intrinsic::pow:
       return TargetOpcode::G_FPOW;
+    case Intrinsic::rint:
+      return TargetOpcode::G_FRINT;
     case Intrinsic::round:
       return TargetOpcode::G_INTRINSIC_ROUND;
     case Intrinsic::sin: