[lld][COFF][LTO] Don't disable verifier in assert builds

We should catch more issues this way.

This previously the behavior and was dropped in cde5e5b.

Reviewed By: hans

Differential Revision: https://reviews.llvm.org/D134839

lld/COFF/LTO.cpp

@@ -76,7 +76,11 @@ static lto::Config createConfig() {
     c.RelocModel = Reloc::Static;
   else
     c.RelocModel = Reloc::PIC_;
+#ifndef NDEBUG
+  c.DisableVerify = false;
+#else
   c.DisableVerify = true;
+#endif
   c.DiagHandler = diagnosticHandler;
   c.OptLevel = config->ltoo;
   c.CPU = getCPUStr();