[lld/COFF] Make test/COFF/start-lib.ll use split-file

The two input files were only used by this one test, so put them inline.

No behavior change.

lld/test/COFF/start-lib.ll

@@ -1,11 +1,14 @@
 ; REQUIRES: x86
-;
-; RUN: llc -filetype=obj %s -o %t.obj
-; RUN: llc -filetype=obj %p/Inputs/start-lib1.ll -o %t1.obj
-; RUN: llc -filetype=obj %p/Inputs/start-lib2.ll -o %t2.obj
-; RUN: opt -thinlto-bc %s -o %t.bc
-; RUN: opt -thinlto-bc %p/Inputs/start-lib1.ll -o %t1.bc
-; RUN: opt -thinlto-bc %p/Inputs/start-lib2.ll -o %t2.bc
+
+; RUN: rm -rf %t.dir
+; RUN: split-file %s %t.dir
+
+; RUN: llc -filetype=obj %t.dir/main.ll -o %t.obj
+; RUN: llc -filetype=obj %t.dir/start-lib1.ll -o %t1.obj
+; RUN: llc -filetype=obj %t.dir/start-lib2.ll -o %t2.obj
+; RUN: opt -thinlto-bc %t.dir/main.ll -o %t.bc
+; RUN: opt -thinlto-bc %t.dir/start-lib1.ll -o %t1.bc
+; RUN: opt -thinlto-bc %t.dir/start-lib2.ll -o %t2.bc
 ;
 ; RUN: lld-link -out:%t1.exe -entry:main -opt:noref -lldmap:%t1.map \
 ; RUN:     %t.obj %t1.obj %t2.obj
@@ -37,9 +40,42 @@
 ; TEST3-NOT: {{ }}foo{{$}}
 ; TEST3-NOT: {{ }}bar{{$}}
 
+
+#--- main.ll
+
 target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
 target triple = "x86_64-pc-windows-msvc"
 
 define void @main() {
   ret void
 }
+
+
+#--- start-lib1.ll
+
+target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-pc-windows-msvc"
+
+declare i32 @bar()
+
+define i32 @foo() {
+  %1 = call i32 () @bar()
+  %2 = add i32 %1, 1
+  ret i32 %2
+}
+
+!llvm.linker.options = !{!0}
+!0 = !{!"/INCLUDE:foo"}
+
+
+#--- start-lib2.ll
+
+target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-pc-windows-msvc"
+
+define i32 @bar() {
+  ret i32 1
+}
+
+!llvm.linker.options = !{!0}
+!0 = !{!"/INCLUDE:bar"}