From 20f9ce651f57d2226a1e47e89b87b034f6a4c1cb Mon Sep 17 00:00:00 2001
From: Jan Kotas <jkotas@microsoft.com>
Date: Thu, 15 Dec 2016 12:59:29 -0800
Subject: [PATCH] Make Unsafe.AsRef inlineable

The JIT inliner chokes on type mismatch on return. Make the method inlineable by round-tripping the value via local that avoids the type mismatch on return.
---
 .../src/System.Runtime.CompilerServices.Unsafe.il             | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.il b/src/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.il
index 869537225894..0eb1aa409191 100644
--- a/src/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.il
+++ b/src/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.il
@@ -222,8 +222,12 @@
   .method public hidebysig static !!T& AsRef<T>(void* source) cil managed aggressiveinlining
   {
         .custom instance void System.Runtime.Versioning.NonVersionableAttribute::.ctor() = ( 01 00 00 00 )
+        .locals (int32&)
         .maxstack 1
         ldarg.0
+        // Roundtrip via a local to avoid type mismatch on return that the JIT inliner chokes on.
+        stloc.0
+        ldloc.0
         ret
   } // end of method Unsafe::AsRef