fix: stop emitting .debug_pubnames and .debug_pubtypes

`.debug_pubnames` and `.debug_pubtypes` are poorly designed and people
seldom use them. However, they take a considerable portion of size in
the final binary. This tells LLVM stop emitting those sections on
DWARFv4 or lower. DWARFv5 use `.debug_names` which is more concise
in size and performant for name lookup.

compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs

@@ -17,6 +17,7 @@ use crate::debuginfo::utils::FatPtrKind;
 use crate::llvm;
 use crate::llvm::debuginfo::{
     DIDescriptor, DIFile, DIFlags, DILexicalBlock, DIScope, DIType, DebugEmissionKind,
+    DebugNameTableKind,
 };
 use crate::value::Value;
 
@@ -878,6 +879,12 @@ pub fn build_compile_unit_di_node<'ll, 'tcx>(
     let split_name = split_name.to_str().unwrap();
     let kind = DebugEmissionKind::from_generic(tcx.sess.opts.debuginfo);
 
+    let dwarf_version =
+        tcx.sess.opts.unstable_opts.dwarf_version.unwrap_or(tcx.sess.target.default_dwarf_version);
+    // Don't emit `.debug_pubnames` and `.debug_pubtypes` on DWARFv4 or lower.
+    let debug_name_table_kind =
+        if dwarf_version > 4 { DebugNameTableKind::Default } else { DebugNameTableKind::None };
+
     unsafe {
         let compile_unit_file = llvm::LLVMRustDIBuilderCreateFile(
             debug_context.builder,
@@ -907,6 +914,7 @@ pub fn build_compile_unit_di_node<'ll, 'tcx>(
             kind,
             0,
             tcx.sess.opts.unstable_opts.split_dwarf_inlining,
+            debug_name_table_kind,
         );
 
         if tcx.sess.opts.unstable_opts.profile {

compiler/rustc_codegen_llvm/src/llvm/ffi.rs

@@ -5,7 +5,7 @@ use super::debuginfo::{
     DIArray, DIBasicType, DIBuilder, DICompositeType, DIDerivedType, DIDescriptor, DIEnumerator,
     DIFile, DIFlags, DIGlobalVariableExpression, DILexicalBlock, DILocation, DINameSpace,
     DISPFlags, DIScope, DISubprogram, DISubrange, DITemplateTypeParameter, DIType, DIVariable,
-    DebugEmissionKind,
+    DebugEmissionKind, DebugNameTableKind,
 };
 
 use libc::{c_char, c_int, c_uint, size_t};
@@ -794,6 +794,15 @@ pub mod debuginfo {
             }
         }
     }
+
+    /// LLVMRustDebugNameTableKind
+    #[derive(Clone, Copy)]
+    #[repr(C)]
+    pub enum DebugNameTableKind {
+        Default,
+        Gnu,
+        None,
+    }
 }
 
 use bitflags::bitflags;
@@ -1812,6 +1821,7 @@ extern "C" {
         kind: DebugEmissionKind,
         DWOId: u64,
         SplitDebugInlining: bool,
+        DebugNameTableKind: DebugNameTableKind,
     ) -> &'a DIDescriptor;
 
     pub fn LLVMRustDIBuilderCreateFile<'a>(