[COFF] added test for thinlto

Summary: Creates bitcode files suitable for use with ThinLTO, then checks that the linker can build an executable from them.

Reviewers: ruiu, pcc

Reviewed By: pcc

Subscribers: mehdi_amini, Prazek, llvm-commits

Differential Revision: https://reviews.llvm.org/D30277

llvm-svn: 296042

lld/test/COFF/thinlto.ll

@@ -0,0 +1,18 @@
+; RUN: rm -fr %T/thinlto
+; RUN: mkdir %T/thinlto
+; RUN: opt -thinlto-bc -o %T/thinlto/main.obj %s
+; RUN: opt -thinlto-bc -o %T/thinlto/foo.obj %S/Inputs/lto-dep.ll
+; RUN: lld-link /lldsavetemps /out:%T/thinlto/main.exe /entry:main /subsystem:console %T/thinlto/main.obj %T/thinlto/foo.obj
+; RUN: llvm-nm %T/thinlto/main.exe.lto.obj | FileCheck %s
+
+; CHECK-NOT: U foo
+
+target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-pc-windows-msvc"
+
+define i32 @main() {
+  call void @foo()
+  ret i32 0
+}
+
+declare void @foo()