Fixed unified-lto-check test for Windows compatibility

Author: fnriv

llvm/test/LTO/Resolution/X86/unified-lto-check.ll

@@ -46,7 +46,7 @@
 ; RUN: not llvm-lto2 run --unified-lto=1 -o %t3 %t1 %t2 2>&1 | \
 ; RUN: FileCheck %s --check-prefix INVALIDMODE
 
-; INVALIDMODE: llvm-lto2: for the --unified-lto option: Cannot find option named
+; INVALIDMODE: for the --unified-lto option: Cannot find option named
 
 
 ; UNIFIEDERR: unified LTO compilation must use compatible bitcode modules