[llvm-dwp] - Reuse object::Decompressor class

One more place where Decompressor class can be reused.

Differential revision: https://reviews.llvm.org/D28679

llvm-svn: 291906
diff --git a/llvm/test/tools/llvm-dwp/X86/compressfail.test b/llvm/test/tools/llvm-dwp/X86/compressfail.test
index 78b6255..b1961e8 100644
--- a/llvm/test/tools/llvm-dwp/X86/compressfail.test
+++ b/llvm/test/tools/llvm-dwp/X86/compressfail.test
@@ -4,4 +4,4 @@
 
 REQUIRES: zlib
 
-CHECK: error: failure while decompressing compressed section: 'zdebug_{{.*}}.dwo'
+CHECK: error: failure while decompressing compressed section: '.zdebug_{{.*}}.dwo'