Adds debuginfo directives to embedded.S and torque-generated .cc files.

This does not change the electron binary in any way (the text is identical), only makes the symbols better.

Revert https://github.com/v8/v8/commit/28e0e97dfe0d2b4587cb8f9a809fcaeb4670546f

reverted:
--- b/v8/src/snapshot/embedded/embedded-file-writer.cc
+++ a/v8/src/snapshot/embedded/embedded-file-writer.cc
@@ -77,10 +77,6 @@ void EmbeddedFileWriter::WriteBuiltin(Pl
   v8::internal::SourcePositionTableIterator positions(
       vpos, SourcePositionTableIterator::kExternalOnly);
 
-#ifndef DEBUG
-  CHECK(positions.done());  // Release builds must not contain debug infos.
-#endif
-
   // Some builtins (InterpreterPushArgsThenFastConstructFunction,
   // JSConstructStubGeneric) have entry points located in the middle of them, we
   // need to store their addresses since they are part of the list of allowed
reverted:
--- b/v8/src/snapshot/embedded/embedded-file-writer.h
+++ a/v8/src/snapshot/embedded/embedded-file-writer.h
@@ -121,11 +121,6 @@
   }
 
   void WriteExternalFilenames(PlatformEmbeddedFileWriterBase* w) const {
-#ifndef DEBUG
-    // Release builds must not contain debug infos.
-    CHECK_EQ(external_filenames_by_index_.size(), 0);
-#endif
-
     w->Comment(
         "Source positions in the embedded blob refer to filenames by id.");
     w->Comment("Assembly directives here map the id to a filename.");
--- src/v8/src/torque/torque-code-generator.cc.orig	2025-05-07 20:01:00.337777745 +0200
+++ src/v8/src/torque/torque-code-generator.cc	2025-05-08 20:03:23.726364897 +0200
@@ -26,11 +26,9 @@ bool TorqueCodeGenerator::IsEmptyInstruc
 
 void TorqueCodeGenerator::EmitInstruction(const Instruction& instruction,
                                           Stack<std::string>* stack) {
-#ifdef DEBUG
   if (!IsEmptyInstruction(instruction)) {
     EmitSourcePosition(instruction->pos);
   }
-#endif
 
   switch (instruction.kind()) {
 #define ENUM_ITEM(T)                                  \
--- src/v8/src/compiler/code-assembler.cc.orig	2025-05-07 20:01:00.165777775 +0200
+++ src/v8/src/compiler/code-assembler.cc	2025-05-08 21:30:20.037471973 +0200
@@ -100,7 +100,9 @@ void CodeAssemblerState::SetInitialDebug
                                                     int line) {
 #if DEBUG
   AssemblerDebugInfo debug_info = {msg, file, line};
+#endif
   raw_assembler_->SetCurrentExternalSourcePosition({file, line});
+#if DEBUG
   raw_assembler_->SetInitialDebugInformation(debug_info);
 #endif  // DEBUG
 }