[lld-macho] Fix "shift exponent too large" UBSAN error

UBSAN seems to have added this check somewhere along the way...

This might also fix the PPC buildbot, which is failing on the same test

lld/MachO/InputFiles.cpp

@@ -254,9 +254,12 @@ void ObjFile::parseSections(ArrayRef<Section> sections) {
     ArrayRef<uint8_t> data = {isZeroFill(sec.flags) ? nullptr
                                                     : buf + sec.offset,
                               static_cast<size_t>(sec.size)};
-    if (sec.align >= 32)
+    if (sec.align >= 32) {
       error("alignment " + std::to_string(sec.align) + " of section " + name +
             " is too large");
+      subsections.push_back({});
+      continue;
+    }
     uint32_t align = 1 << sec.align;
     uint32_t flags = sec.flags;