Introduce a benchmark template [ci skip]

This replaces boilerplate in the “benchmark your code” section of the
contributors’ guide with an executable template. I also amended the text
to encourage best practices and codified it in the template.

For now this is only good for relatively self-contained changes that can
be inlined into a simple script. In the future, this can be expanded to
cover how to measure the difference between two commits.

The output looks like this:

```
==================================== Empty =====================================

Warming up --------------------------------------
              blank?   225.963k i/100ms
         fast_blank?   238.147k i/100ms
Calculating -------------------------------------
              blank?      8.825M (± 6.4%) i/s -     44.063M in   5.014824s
         fast_blank?      9.311M (± 6.3%) i/s -     46.439M in   5.009153s

Comparison:
         fast_blank?:  9310694.8 i/s
              blank?:  8824801.7 i/s - same-ish: difference falls within error


================================= Single Space =================================

Warming up --------------------------------------
              blank?    56.581k i/100ms
         fast_blank?   232.774k i/100ms
Calculating -------------------------------------
              blank?    813.985k (±16.7%) i/s -      4.017M in   5.076576s
         fast_blank?      9.547M (± 5.2%) i/s -     47.719M in   5.013204s

Comparison:
         fast_blank?:  9547414.0 i/s
              blank?:   813985.0 i/s - 11.73x  slower


================================== Two Spaces ==================================

Warming up --------------------------------------
              blank?    58.265k i/100ms
         fast_blank?   244.056k i/100ms
Calculating -------------------------------------
              blank?    823.343k (±16.2%) i/s -      4.020M in   5.014213s
         fast_blank?      9.484M (± 4.9%) i/s -     47.347M in   5.005339s

Comparison:
         fast_blank?:  9484021.6 i/s
              blank?:   823343.1 i/s - 11.52x  slower


=============================== Mixed Whitspaces ===============================

Warming up --------------------------------------
              blank?    53.919k i/100ms
         fast_blank?   237.103k i/100ms
Calculating -------------------------------------
              blank?    763.435k (±16.8%) i/s -      3.720M in   5.018029s
         fast_blank?      9.672M (± 5.8%) i/s -     48.369M in   5.019356s

Comparison:
         fast_blank?:  9672467.2 i/s
              blank?:   763435.4 i/s - 12.67x  slower


=============================== Very Long String ===============================

Warming up --------------------------------------
              blank?    34.037k i/100ms
         fast_blank?   240.366k i/100ms
Calculating -------------------------------------
              blank?    409.731k (± 8.9%) i/s -      2.042M in   5.028235s
         fast_blank?      9.794M (± 4.3%) i/s -     49.035M in   5.016328s

Comparison:
         fast_blank?:  9794225.2 i/s
              blank?:   409731.4 i/s - 23.90x  slower
```

1 files changed, 49 insertions, 0 deletions

diff --git a/guides/bug_report_templates/benchmark.rb b/guides/bug_report_templates/benchmark.rb
new file mode 100644
index 0000000000..ae51d7027f
--- /dev/null
+++ b/guides/bug_report_templates/benchmark.rb
@@ -0,0 +1,49 @@
+begin
+  require "bundler/inline"
+rescue LoadError => e
+  $stderr.puts "Bundler version 1.10 or later is required. Please update your Bundler"
+  raise e
+end
+
+gemfile(true) do
+  source "https://rubygems.org"
+  gem "rails", github: "rails/rails"
+  gem "benchmark-ips"
+end
+
+require "active_support"
+require "active_support/core_ext/object/blank"
+
+# Your patch goes here.
+class String
+  def fast_blank?
+    true
+  end
+end
+
+# Enumerate some representative scenarios here.
+#
+# It is very easy to make an optimization that improves performance for a
+# specific scenario you care about but regresses on other common cases.
+# Therefore, you should test your change against a list of representative
+# scenarios. Ideally, they should be based on real-world scenarios extracted
+# from production applications.
+SCENARIOS = {
+  "Empty"            => "",
+  "Single Space"     => " ",
+  "Two Spaces"       => "  ",
+  "Mixed Whitspaces" => " \t\r\n",
+  "Very Long String" => " " * 100
+}
+
+SCENARIOS.each_pair do |name, value|
+  puts
+  puts " #{name} ".center(80, "=")
+  puts
+
+  Benchmark.ips do |x|
+    x.report('blank?')      { value.blank? }
+    x.report('fast_blank?') { value.fast_blank? }
+    x.compare!
+  end
+end