[GlobalISel][AArch64] Legalize + select G_FRINT

Exactly the same as G_FCEIL, G_FABS, etc.

Add tests for the fp16/nofp16 behaviour, update arm64-vfloatintrinsics, etc.

Differential Revision: https://reviews.llvm.org/D60895

llvm-svn: 358799
diff --git a/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp b/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
index 9ab14d5..71e7b16 100644
--- a/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
@@ -1315,6 +1315,7 @@
   case TargetOpcode::G_FLOG10:
   case TargetOpcode::G_FLOG:
   case TargetOpcode::G_FLOG2:
+  case TargetOpcode::G_FRINT:
   case TargetOpcode::G_FSQRT:
   case TargetOpcode::G_FEXP:
   case TargetOpcode::G_FEXP2:
@@ -2183,6 +2184,7 @@
   case G_FLOG10:
   case G_FCEIL:
   case G_FFLOOR:
+  case G_FRINT:
   case G_INTRINSIC_ROUND:
   case G_INTRINSIC_TRUNC:
   case G_FCOS: