EASY: Remove dependency on -g3 for emitting line directives

Summary:
Change emitLineDirectives to depend only on the explicit
-Xline-directives flag, removing the condition that checked for
DebugInfoLevel >= g3. Since g3 is deprecated and maps to g2, the
condition DebugInfoLevel >= g3 can never be true, making that part of
the check dead code. This change makes the code accurately reflect the
actual behavior: line directives are only emitted when explicitly
requested via -Xline-directives.

Reviewed By: avp

Differential Revision: D87034836

fbshipit-source-id: 5197223d35114ee19afaf2f4d3f111795a822cce

Co-authored-by: Claude (Anthropic AI Assistant) for AI-driven

Author: Tzvetan Mikov

tools/shermes/shermes.cpp

@@ -689,7 +689,6 @@ std::shared_ptr<Context> createContext() {
   } else if (cli::DebugInfoLevel == DebugLevel::g2) {
     context->setDebugInfoSetting(DebugInfoSetting::SOURCE_MAP);
   } else if (cli::DebugInfoLevel == DebugLevel::g1) {
-    // -g1 or -g0. If -g0, we'll strip debug info later.
     context->setDebugInfoSetting(DebugInfoSetting::THROWING);
   } else {
     context->setDebugInfoSetting(DebugInfoSetting::NONE);
@@ -1015,10 +1014,8 @@ bool compileFromCommandLineOptions() {
   genOptions.emitSourceLocations =
       cli::DumpSourceLocation != LocationDumpMode::None;
 
-  // Emit line directives if we have full debug info enabled or it was
-  // explicitly requested.
-  genOptions.emitLineDirectives =
-      cli::DebugInfoLevel >= DebugLevel::g3 || cli::ForceLineDirectives;
+  // Emit line directives if explicitly requested.
+  genOptions.emitLineDirectives = cli::ForceLineDirectives;
 
   ShermesCompileParams params(genOptions);
   // Populate all fields of ShermesCompileParams.