llvm-dwp: Don't test compression when zlib isn't available

llvm-svn: 261298

llvm/test/tools/llvm-dwp/X86/compress.test

@@ -1,6 +1,8 @@
 RUN: llvm-dwp %p/../Inputs/compress/a.dwo -o %t
 RUN: llvm-dwarfdump %t | FileCheck %s
 
+REQUIRES: zlib
+
 Simple test built from this input which produces DWARF long enough to be compressed in the .[z]debug_info section:
 
   void f(int a, int b, int c, int d) {

llvm/tools/llvm-dwp/llvm-dwp.cpp

@@ -350,7 +350,7 @@ static std::error_code write(MCStreamer &Out, ArrayRef<std::string> Inputs) {
         uint64_t OriginalSize;
         if (!zlib::isAvailable() ||
             !consumeCompressedDebugSectionHeader(Contents, OriginalSize))
-          continue;
+          return make_error_code(std::errc::invalid_argument);
         UncompressedSections.resize(UncompressedSections.size() + 1);
         if (zlib::uncompress(Contents, UncompressedSections.back(), OriginalSize) !=
             zlib::StatusOK) {