Rename rustdoc::html::render::cache to search_index

The old name wasn't very clear, while the new one makes it clear that
this is the code responsible for creating the search index.

src/librustdoc/clean/types.rs

@@ -38,7 +38,7 @@ use crate::clean::Clean;
 use crate::core::DocContext;
 use crate::formats::cache::Cache;
 use crate::formats::item_type::ItemType;
-use crate::html::render::cache::ExternalLocation;
+use crate::html::render::search_index::ExternalLocation;
 use crate::html::render::Context;
 
 crate use self::FnRetTy::*;

src/librustdoc/formats/cache.rs

@@ -12,7 +12,7 @@ use crate::fold::DocFolder;
 use crate::formats::item_type::ItemType;
 use crate::formats::Impl;
 use crate::html::markdown::short_markdown_summary;
-use crate::html::render::cache::{get_index_search_type, ExternalLocation};
+use crate::html::render::search_index::{get_index_search_type, ExternalLocation};
 use crate::html::render::IndexItem;
 
 /// This cache is used to store information about the [`clean::Crate`] being

src/librustdoc/html/format.rs

@@ -24,7 +24,7 @@ use rustc_target::spec::abi::Abi;
 use crate::clean::{self, utils::find_nearest_parent_module, ExternalCrate, ItemId, PrimitiveType};
 use crate::formats::item_type::ItemType;
 use crate::html::escape::Escape;
-use crate::html::render::cache::ExternalLocation;
+use crate::html::render::search_index::ExternalLocation;
 use crate::html::render::Context;
 
 use super::url_parts_builder::UrlPartsBuilder;

src/librustdoc/html/render/context.rs

@@ -13,8 +13,8 @@ use rustc_span::edition::Edition;
 use rustc_span::source_map::FileName;
 use rustc_span::symbol::sym;
 
-use super::cache::{build_index, ExternalLocation};
 use super::print_item::{full_path, item_path, print_item};
+use super::search_index::{build_index, ExternalLocation};
 use super::templates;
 use super::write_shared::write_shared;
 use super::{

src/librustdoc/html/render/mod.rs

@@ -23,7 +23,7 @@
 //! These threads are not parallelized (they haven't been a bottleneck yet), and
 //! both occur before the crate is rendered.
 
-crate mod cache;
+crate mod search_index;
 
 #[cfg(test)]
 mod tests;

src/librustdoc/json/mod.rs

@@ -24,7 +24,7 @@ use crate::config::RenderOptions;
 use crate::error::Error;
 use crate::formats::cache::Cache;
 use crate::formats::FormatRenderer;
-use crate::html::render::cache::ExternalLocation;
+use crate::html::render::search_index::ExternalLocation;
 use crate::json::conversions::{from_item_id, IntoWithTcx};
 
 #[derive(Clone)]