[flang][f18] Remove "-fdebug-resolve-names"

[awarzynski]

Summary

This option doesn't enable any unique feature/code-patch. Also, it is
neither tested nor documented.

flang/tools/f18/f18.cpp

struct DriverOptions {
   bool parseOnly{false};
   bool dumpProvenance{false};
   bool dumpCookedChars{false};
   bool dumpUnparse{false};
   bool dumpUnparseWithSymbols{false};
   bool dumpParseTree{false};
   bool dumpPreFirTree{false};
   bool dumpSymbols{false};
-  bool debugResolveNames{false};
   bool debugNoSemantics{false};
   bool debugModuleWriter{false};
   bool measureTree{false};
   bool unparseTypedExprsToF18_FC{false};
   std::vector<std::string> F18_FCArgs;
   const char *prefix{nullptr};
   bool getDefinition{false};
   GetDefinitionArgs getDefinitionArgs{0, 0, 0};
if ((!parsing.messages().empty() &&
     llvm::errs() << driver.prefix << "could not parse " << path << '\n';
     exitStatus = EXIT_FAILURE;
     return {};
   }
   auto &parseTree{*parsing.parseTree()};
   if (driver.measureTree) {
     MeasureParseTree(parseTree);
   }
-  if (!driver.debugNoSemantics || driver.debugResolveNames ||
-      driver.dumpSymbols || driver.dumpUnparseWithSymbols ||
-      driver.getDefinition || driver.getSymbolsSources) {
+  if (!driver.debugNoSemantics || driver.dumpSymbols ||
+      driver.dumpUnparseWithSymbols || driver.getDefinition ||
+      driver.getSymbolsSources) {
     Fortran::semantics::Semantics semantics{semanticsContext, parseTree,
         parsing.cooked().AsCharBlock(), driver.debugModuleWriter};
     semantics.Perform();
     semantics.EmitMessages(llvm::errs());
     if (driver.dumpSymbols) {
       semantics.DumpSymbols(llvm::outs());
     }
     if (semantics.AnyFatalError()) {
if (arg.empty()) {
       driver.dumpProvenance = true;
       options.needProvenanceRangeToCharBlockMappings = true;
     } else if (arg == "-fdebug-dump-parse-tree") {
       driver.dumpParseTree = true;
     } else if (arg == "-fdebug-pre-fir-tree") {
       driver.dumpPreFirTree = true;
     } else if (arg == "-fdebug-dump-symbols") {
       driver.dumpSymbols = true;
-    } else if (arg == "-fdebug-resolve-names") {
-      driver.debugResolveNames = true;
     } else if (arg == "-fdebug-module-writer") {
       driver.debugModuleWriter = true;
     } else if (arg == "-fdebug-measure-parse-tree") {
       driver.measureTree = true;
     } else if (arg == "-fdebug-instrumented-parse") {
       options.instrumentedParse = true;
     } else if (arg == "-fdebug-no-semantics") {
       driver.debugNoSemantics = true;
if (arg.empty()) {
           << "  -fparse-only         parse only, no output except messages\n"
           << "  -funparse            parse & reformat only, no code "
              "generation\n"
           << "  -funparse-with-symbols  parse, resolve symbols, and unparse\n"
           << "  -fdebug-measure-parse-tree\n"
           << "  -fdebug-dump-provenance\n"
           << "  -fdebug-dump-parse-tree\n"
           << "  -fdebug-dump-symbols\n"
-          << "  -fdebug-resolve-names\n"
           << "  -fdebug-instrumented-parse\n"
           << "  -fdebug-no-semantics  disable semantic checks\n"
           << "  -fget-definition\n"
           << "  -fget-symbols-sources\n"
           << "  -v -c -o -I -D -U    have their usual meanings\n"
           << "  -help                print this again\n"
           << "Unrecognised options are passed through to the external "
              "compiler\n"