From 9bb6931c257c420d53c5e0098faf5ce08fe6dbc9 Mon Sep 17 00:00:00 2001
From: Tim Northover <tnorthover@apple.com>
Date: Mon, 1 May 2017 17:50:15 +0000
Subject: [PATCH] X86: initialize a few subtarget variables.

Otherwise an indeterminate value gets read, causing a bunch of UBSan failures.

llvm-svn: 301819
---
 llvm/lib/Target/X86/X86Subtarget.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/llvm/lib/Target/X86/X86Subtarget.cpp b/llvm/lib/Target/X86/X86Subtarget.cpp
index b805ddf..82ff436 100644
--- a/llvm/lib/Target/X86/X86Subtarget.cpp
+++ b/llvm/lib/Target/X86/X86Subtarget.cpp
@@ -290,6 +290,9 @@ void X86Subtarget::initializeEnvironment() {
   HasMWAITX = false;
   HasCLZERO = false;
   HasMPX = false;
+  HasSGX = false;
+  HasCLFLUSHOPT = false;
+  HasCLWB = false;
   IsBTMemSlow = false;
   IsPMULLDSlow = false;
   IsSHLDSlow = false;
-- 
2.7.4