dangling references to run-bench -> bench/run

4fab6c1 added the current bench
runner script as `benches/run`, and removed the old `run-bench`
script. It was later renamed to `bench/run` when `benches` was
renamed to `bench` in b217bfe.
This patch fixes a few references to the old benchmark runner
in the hacking guide as well as a few references to the old
directory structure. The cargo plugin syntax in the example
is also updated.

HACKING.md

@@ -270,9 +270,9 @@ N.B. To run tests for the `regex!` macro, use:
 
 The benchmarking in this crate is made up of many micro-benchmarks. Currently,
 there are two primary sets of benchmarks: the benchmarks that were adopted
-at this library's inception (in `benches/src/misc.rs`) and a newer set of
+at this library's inception (in `bench/src/misc.rs`) and a newer set of
 benchmarks meant to test various optimizations. Specifically, the latter set
-contain some analysis and are in `benches/src/sherlock.rs`. Also, the latter
+contain some analysis and are in `bench/src/sherlock.rs`. Also, the latter
 set are all executed on the same lengthy input whereas the former benchmarks
 are executed on strings of varying length.
 
@@ -299,17 +299,17 @@ library benchmarks (especially RE2).
 If you're hacking on one of the matching engines and just want to see
 benchmarks, then all you need to run is:
 
-    $ ./run-bench rust
+    $ ./bench/run rust
 
 If you want to compare your results with older benchmarks, then try:
 
-    $ ./run-bench rust | tee old
+    $ ./bench/run rust | tee old
     $ ... make it faster
-    $ ./run-bench rust | tee new
-    $ cargo-benchcmp old new --improvements
+    $ ./bench/run rust | tee new
+    $ cargo benchcmp old new --improvements
 
 The `cargo-benchcmp` utility is available here:
 https://github.com/BurntSushi/cargo-benchcmp
 
-The `run-bench` utility can run benchmarks for PCRE and Oniguruma too. See
-`./run-bench --help`.
+The `./bench/run` utility can run benchmarks for PCRE and Oniguruma too. See
+`./bench/bench --help`.

bench/Cargo.toml

@@ -40,8 +40,7 @@ bench = false
 # Doing anything else will probably result in weird "duplicate definition"
 # compiler errors.
 #
-# Tip: use the run-bench script in the root of this repository to run
-# benchmarks.
+# Tip: use the `bench/run` script (in this directory) to run benchmarks.
 [features]
 re-pcre1 = ["libpcre-sys"]
 re-pcre2 = []