[clang][Interp] Only generate disassembly in debug builds

[tbaeder]

Summary

With the current set of opcodes, this saves 3460 lines in the generated
Opcodes.inc in release builds (-17%).

The dump() code is only used for debugging right now as far as I know (there is nothing equivalent to -ast-dump), so only generate this code for debug builds.

[tbaeder]

Ping

clang/lib/AST/Interp/Disasm.cpp

template <typename T> inline T ReadArg(Program &P, CodePtr &OpPC) {
   } else {
     return OpPC.read<T>();
   }
 }
 
 LLVM_DUMP_METHOD void Function::dump() const { dump(llvm::errs()); }
 
 LLVM_DUMP_METHOD void Function::dump(llvm::raw_ostream &OS) const {
+#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
   if (F) {
     if (const auto *MD = dyn_cast<CXXMethodDecl>(F))
       OS << MD->getParent()->getDeclName() << "::";
     OS << F->getDeclName() << " " << (const void *)this << ":\n";
   } else {
     OS << "<<expr>>\n";
   }
 
for (CodePtr Start = getCodeBegin(), PC = Start; PC != getCodeEnd();) {
     auto Op = PC.read<Opcode>();
     OS << llvm::format("%8d", Addr) << " ";
     switch (Op) {
 #define GET_DISASM
 #include "Opcodes.inc"
 #undef GET_DISASM
     }
   }
+#endif
 }
 
 LLVM_DUMP_METHOD void Program::dump() const { dump(llvm::errs()); }
 
 LLVM_DUMP_METHOD void Program::dump(llvm::raw_ostream &OS) const {
   OS << ":: Program\n";
   OS << "Global Variables: " << Globals.size() << "\n";
   OS << "Functions: " << Funcs.size() << "\n";
   OS << "\n";
   for (auto &Func : Funcs) {
     Func.second->dump();
   }
   for (auto &Anon : AnonFuncs) {
     Anon->dump();
   }
 }

clang/utils/TableGen/ClangOpcodesEmitter.cpp

Enumerate(R, N, [this, R, &OS, &N](ArrayRef<Record *> TS, const Twine &ID) {
 
     OS << "  continue;\n";
     OS << "}\n";
   });
   OS << "#endif\n";
 }
 
 void ClangOpcodesEmitter::EmitDisasm(raw_ostream &OS, StringRef N, Record *R) {
+#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
   OS << "#ifdef GET_DISASM\n";
   Enumerate(R, N, [R, &OS](ArrayRef<Record *>, const Twine &ID) {
     OS << "case OP_" << ID << ":\n";
     OS << "  PrintName(\"" << ID << "\");\n";
     OS << "  OS << \"\\t\"";
 
     for (auto *Arg : R->getValueAsListOfDefs("Args")) {
       OS << " << ReadArg<" << Arg->getValueAsString("Name") << ">(P, PC)";
       OS << " << \" \"";
     }
 
     OS << " << \"\\n\";\n";
     OS << "  continue;\n";
   });
   OS << "#endif\n";
+#endif
 }
 
 void ClangOpcodesEmitter::EmitEmitter(raw_ostream &OS, StringRef N, Record *R) {
   if (R->getValueAsBit("HasCustomLink"))
     return;
 
   OS << "#ifdef GET_LINK_IMPL\n";
   Enumerate(R, N, [R, &OS](ArrayRef<Record *>, const Twine &ID) {