Some comment nits

Author: oli-obk

compiler/rustc_codegen_gcc/src/mono_item.rs

@@ -26,7 +26,7 @@ impl<'gcc, 'tcx> PreDefineMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
  let attrs = self.tcx.codegen_fn_attrs(def_id);
  let instance = Instance::mono(self.tcx, def_id);
  let DefKind::Static { nested, .. } = self.tcx.def_kind(def_id) else { bug!() };
- // Nested statics do not have a type, so pick a random type and let `define_static` figure out
+ // Nested statics do not have a type, so pick a dummy type and let `codegen_static` figure out
  // the gcc type from the actual evaluated initializer.
  let ty = if nested {
  self.tcx.types.unit

compiler/rustc_codegen_llvm/src/consts.rs

@@ -232,7 +232,7 @@ impl<'ll> CodegenCx<'ll, '_> {
  trace!(?instance);
 
  let DefKind::Static { nested, .. } = self.tcx.def_kind(def_id) else { bug!() };
- // Nested statics do not have a type, so pick a random type and let `define_static` figure out
+ // Nested statics do not have a type, so pick a dummy type and let `codegen_static` figure out
  // the llvm type from the actual evaluated initializer.
  let llty = if nested {
  self.type_i8()
@@ -415,8 +415,7 @@ impl<'ll> CodegenCx<'ll, '_> {
  llvm::LLVMRustSetDSOLocal(g, true);
  }
 
- // As an optimization, all shared statics which do not have interior
- // mutability are placed into read-only memory.
+ // Forward the allocation's mutability (picked by the const interner) to LLVM.
  if alloc.mutability.is_not() {
  llvm::LLVMSetGlobalConstant(g, llvm::True);
  }

compiler/rustc_codegen_llvm/src/mono_item.rs

@@ -24,7 +24,7 @@ impl<'tcx> PreDefineMethods<'tcx> for CodegenCx<'_, 'tcx> {
  ) {
  let instance = Instance::mono(self.tcx, def_id);
  let DefKind::Static { nested, .. } = self.tcx.def_kind(def_id) else { bug!() };
- // Nested statics do not have a type, so pick a random type and let `define_static` figure out
+ // Nested statics do not have a type, so pick a dummy type and let `codegen_static` figure out
  // the llvm type from the actual evaluated initializer.
  let ty = if nested {
  self.tcx.types.unit

compiler/rustc_hir/src/def.rs

@@ -251,7 +251,7 @@ impl DefKind {
  | DefKind::TyParam
  | DefKind::ExternCrate => DefPathData::TypeNs(name),
  // It's not exactly an anon const, but wrt DefPathData, there
- // is not difference.
+ // is no difference.
  DefKind::Static { nested: true, .. } => DefPathData::AnonConst,
  DefKind::Fn
  | DefKind::Const