Rollup merge of rust-lang#56869 - GuillaumeGomez:index-size-reduction, r=QuietMisdreavus

Reduce search-index.js size

Coming from:

```
1735683 Dec 16 01:35 build/x86_64-apple-darwin/doc/search-index.js
```

to:

```
727755 Dec 16 01:51 build/x86_64-apple-darwin/doc/search-index.js
```

r? @QuietMisdreavus

Author: Centril

Cargo.lock

@@ -1334,7 +1334,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "minifier"
-version = "0.0.20"
+version = "0.0.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "macro-utils 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2686,7 +2686,7 @@ dependencies = [
 name = "rustdoc"
 version = "0.0.0"
 dependencies = [
- "minifier 0.0.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "minifier 0.0.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "pulldown-cmark 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempfile 3.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3502,7 +3502,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum memchr 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "0a3eb002f0535929f1199681417029ebea04aadc0c7a4224b46be99c7f5d6a16"
 "checksum memmap 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "e2ffa2c986de11a9df78620c01eeaaf27d94d3ff02bf81bfcca953102dd0c6ff"
 "checksum memoffset 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "0f9dc261e2b62d7a622bf416ea3c5245cdd5d9a7fcc428c0d06804dfce1775b3"
-"checksum minifier 0.0.20 (registry+https://github.com/rust-lang/crates.io-index)" = "96c269bb45c39b333392b2b18ad71760b34ac65666591386b0e959ed58b3f474"
+"checksum minifier 0.0.21 (registry+https://github.com/rust-lang/crates.io-index)" = "9707d0ff1b828cba09c4bb27d5c3dceb6f49bd46f700042343bea350a131bf4f"
 "checksum miniz-sys 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)" = "0300eafb20369952951699b68243ab4334f4b10a88f411c221d444b36c40e649"
 "checksum miniz_oxide 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5ad30a47319c16cde58d0314f5d98202a80c9083b5f61178457403dfb14e509c"
 "checksum miniz_oxide_c_api 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "28edaef377517fd9fe3e085c37d892ce7acd1fbeab9239c5a36eec352d8a8b7e"

src/librustdoc/Cargo.toml

@@ -9,6 +9,6 @@ path = "lib.rs"
 
 [dependencies]
 pulldown-cmark = { version = "0.1.2", default-features = false }
-minifier = "0.0.20"
+minifier = "0.0.21"
 tempfile = "3"
 parking_lot = "0.6.4"

src/librustdoc/html/render.rs

@@ -1221,7 +1221,10 @@ fn write_minify_replacer<W: Write>(dst: &mut W,
                                    -> io::Result<()> {
     if enable_minification {
         writeln!(dst, "{}",
-                 minifier::js::minify_and_replace_keywords(contents, keywords_to_replace))
+                 minifier::js::minify_and_replace_keywords(contents, keywords_to_replace)
+                              .apply(minifier::js::clean_tokens)
+                              .apply(minifier::js::aggregate_strings)
+                              .to_string())
     } else {
         writeln!(dst, "{}", contents)
     }