Linker/module-max-warn.ll: Fix test to be compatible with Windows file separators

(cherry picked from commit 84eeee6)

Author: dwblaikie

llvm/test/Linker/module-max-warn.ll

@@ -1,7 +1,7 @@
 ; RUN: llvm-link %s %p/Inputs/module-max-warn.ll -S -o - 2>&1 | FileCheck %s
 
-; CHECK: warning: linking module flags 'Combine Max and Warn': IDs have conflicting values ('i32 4' from {{.*}}/test/Linker/Inputs/module-max-warn.ll with 'i32 2' from llvm-link)
-; CHECK: warning: linking module flags 'Combine Warn and Max': IDs have conflicting values ('i32 5' from {{.*}}/test/Linker/Inputs/module-max-warn.ll with 'i32 3' from llvm-link)
+; CHECK: warning: linking module flags 'Combine Max and Warn': IDs have conflicting values ('i32 4' from {{.*}}/Inputs/module-max-warn.ll with 'i32 2' from llvm-link)
+; CHECK: warning: linking module flags 'Combine Warn and Max': IDs have conflicting values ('i32 5' from {{.*}}/Inputs/module-max-warn.ll with 'i32 3' from llvm-link)
 
 
 ; CHECK: !0 = !{i32 7, !"Combine Max and Warn", i32 4}