Fix bot failure due to new test

I had updated the output file name but not the corresponding nm based check
before submitting as r279023. This should fix the bot failures

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@279025 91177308-0d34-0410-b5e6-96231b3b80d8

test/tools/gold/X86/common_thinlto.ll

@@ -14,7 +14,7 @@
 ; bar should still exist (if we had internalized P it would look dead).
 ; OPT: @bar
 
-; RUN: llvm-nm %t3.o | FileCheck %s --check-prefix=NM
+; RUN: llvm-nm %t3 | FileCheck %s --check-prefix=NM
 ; NM: bar
 
 source_filename = "common1.c"