[MS ABI] Implement thread-safe initialization using the MSVC 2015 ABI

The MSVC 2015 ABI utilizes a rather straightforward adaptation of the
algorithm found in the appendix of N2382.  While we are here, implement
support for emitting cleanups if an exception is thrown while we are
intitializing a static local variable.

llvm-svn: 236697
diff --git a/clang/test/CodeGenCXX/dllimport.cpp b/clang/test/CodeGenCXX/dllimport.cpp
index d2c6765..2fca59c 100644
--- a/clang/test/CodeGenCXX/dllimport.cpp
+++ b/clang/test/CodeGenCXX/dllimport.cpp
@@ -1,13 +1,13 @@
-// RUN: %clang_cc1 -triple i686-windows-msvc   -fno-rtti -emit-llvm -std=c++1y -O0 -o - %s -DMSABI -w | FileCheck --check-prefix=MSC --check-prefix=M32 %s
-// RUN: %clang_cc1 -triple x86_64-windows-msvc -fno-rtti -emit-llvm -std=c++1y -O0 -o - %s -DMSABI -w | FileCheck --check-prefix=MSC --check-prefix=M64 %s
-// RUN: %clang_cc1 -triple i686-windows-gnu    -fno-rtti -emit-llvm -std=c++1y -O0 -o - %s         -w | FileCheck --check-prefix=GNU --check-prefix=G32 %s
-// RUN: %clang_cc1 -triple x86_64-windows-gnu  -fno-rtti -emit-llvm -std=c++1y -O0 -o - %s         -w | FileCheck --check-prefix=GNU --check-prefix=G64 %s
-// RUN: %clang_cc1 -triple i686-windows-msvc   -fno-rtti -emit-llvm -std=c++1y -O1 -o - %s -DMSABI -w | FileCheck --check-prefix=MO1 %s
-// RUN: %clang_cc1 -triple i686-windows-gnu    -fno-rtti -emit-llvm -std=c++1y -O1 -o - %s         -w | FileCheck --check-prefix=GO1 %s
+// RUN: %clang_cc1 -triple i686-windows-msvc   -fno-rtti -fno-threadsafe-statics -emit-llvm -std=c++1y -O0 -o - %s -DMSABI -w | FileCheck --check-prefix=MSC --check-prefix=M32 %s
+// RUN: %clang_cc1 -triple x86_64-windows-msvc -fno-rtti -fno-threadsafe-statics -emit-llvm -std=c++1y -O0 -o - %s -DMSABI -w | FileCheck --check-prefix=MSC --check-prefix=M64 %s
+// RUN: %clang_cc1 -triple i686-windows-gnu    -fno-rtti -fno-threadsafe-statics -emit-llvm -std=c++1y -O0 -o - %s         -w | FileCheck --check-prefix=GNU --check-prefix=G32 %s
+// RUN: %clang_cc1 -triple x86_64-windows-gnu  -fno-rtti -fno-threadsafe-statics -emit-llvm -std=c++1y -O0 -o - %s         -w | FileCheck --check-prefix=GNU --check-prefix=G64 %s
+// RUN: %clang_cc1 -triple i686-windows-msvc   -fno-rtti -fno-threadsafe-statics -emit-llvm -std=c++1y -O1 -o - %s -DMSABI -w | FileCheck --check-prefix=MO1 %s
+// RUN: %clang_cc1 -triple i686-windows-gnu    -fno-rtti -fno-threadsafe-statics -emit-llvm -std=c++1y -O1 -o - %s         -w | FileCheck --check-prefix=GO1 %s
 
 // CHECK-NOT doesn't play nice with CHECK-DAG, so use separate run lines.
-// RUN: %clang_cc1 -triple i686-windows-msvc   -fno-rtti -emit-llvm -std=c++1y -O0 -o - %s -DMSABI -w | FileCheck --check-prefix=MSC2 %s
-// RUN: %clang_cc1 -triple i686-windows-gnu    -fno-rtti -emit-llvm -std=c++1y -O0 -o - %s         -w | FileCheck --check-prefix=GNU2 %s
+// RUN: %clang_cc1 -triple i686-windows-msvc   -fno-rtti -fno-threadsafe-statics -emit-llvm -std=c++1y -O0 -o - %s -DMSABI -w | FileCheck --check-prefix=MSC2 %s
+// RUN: %clang_cc1 -triple i686-windows-gnu    -fno-rtti -fno-threadsafe-statics -emit-llvm -std=c++1y -O0 -o - %s         -w | FileCheck --check-prefix=GNU2 %s
 
 // Helper structs to make templates more expressive.
 struct ImplicitInst_Imported {};