cherry-pick fix to build rust 1.41.0

2153c4b8281c1e5f25887ef9183947198c50a9d2.patch

@@ -0,0 +1,33 @@
+From 2153c4b8281c1e5f25887ef9183947198c50a9d2 Mon Sep 17 00:00:00 2001
+From: Philip Reames <listmail@philipreames.com>
+Date: Tue, 19 Mar 2019 17:20:49 +0000
+Subject: [PATCH] [AtomicExpand] Fix a crash bug when lowering unordered loads
+ to cmpxchg
+
+Add tests for wider atomic loads and stores.  In the process, fix a crasher where we appearently handled unorder stores, but not loads, when lowering to cmpxchg idioms.
+
+llvm-svn: 356482
+
+################################################################
+Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1797127
+       https://github.com/rust-lang/compiler-builtins/issues/338
+
+[ mikhailnov: backported to llvm8, removed tests ]
+################################################################
+
+---
+diff --git a/llvm/lib/CodeGen/AtomicExpandPass.cpp b/llvm/lib/CodeGen/AtomicExpandPass.cpp
+index 10dd21d1ef9d..7a8013abccfb 100644
+--- a/llvm/lib/CodeGen/AtomicExpandPass.cpp
++++ b/llvm/lib/CodeGen/AtomicExpandPass.cpp
+@@ -431,6 +431,9 @@
+ bool AtomicExpand::expandAtomicLoadToCmpXchg(LoadInst *LI) {
+   IRBuilder<> Builder(LI);
+   AtomicOrdering Order = LI->getOrdering();
++  if (Order == AtomicOrdering::Unordered)
++    Order = AtomicOrdering::Monotonic;
++
+   Value *Addr = LI->getPointerOperand();
+   Type *Ty = cast<PointerType>(Addr->getType())->getElementType();
+   Constant *DummyVal = Constant::getNullValue(Ty);
+

llvm.spec

@@ -27,7 +27,7 @@
 Summary:	Low Level Virtual Machine (LLVM)
 Name:		llvm
 Version:	%{major_ver}.%{minor_ver}
-Release:	1
+Release:	2
 License:	NCSA
 Group:		Development/Other
 Url:		http://llvm.org/
@@ -46,6 +46,7 @@ Source1011:	clang-gcc-wrapper.sh
 #Patch1:		clang-rosa.patch
 #
 Patch2:		cfe-7.0.0-i586-unknown-linux-gnu.patch
+Patch3:		2153c4b8281c1e5f25887ef9183947198c50a9d2.patch
 
 BuildRequires:	binutils-devel
 BuildRequires:	bison
@@ -348,7 +349,7 @@ cd tools/clang
 %patch2 -p1 -b .gnu~
 cd -
 %endif
-
+%patch3 -p2
 
 %build
 # Build with gcc/g++, not clang if it happens to be installed