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This commit speeds up rendering partials by caching the variable name
calculation on the template. The variable name is based on the "virtual
path" used for looking up the template. The same virtual path
information lives on the template, so we can just ask the cached
template object for the variable.
This benchmark takes a couple files, so I'll cat them below:
```
[aaron@TC ~/g/r/actionview (speed-up-partials)]$ cat render_benchmark.rb
require "benchmark/ips"
require "action_view"
require "action_pack"
require "action_controller"
class TestController < ActionController::Base
end
TestController.view_paths = [File.expand_path("test/benchmarks")]
controller_view = TestController.new.view_context
result = Benchmark.ips do |x|
x.report("render") do
controller_view.render("many_partials")
end
end
[aaron@TC ~/g/r/actionview (speed-up-partials)]$ cat test/benchmarks/test/_many_partials.html.erb
Looping:
<ul>
<% 100.times do |i| %>
<%= render partial: "list_item", locals: { i: i } %>
<% end %>
</ul>
[aaron@TC ~/g/r/actionview (speed-up-partials)]$ cat test/benchmarks/test/_list_item.html.erb
<li>Number: <%= i %></li>
```
Benchmark results (master):
```
[aaron@TC ~/g/r/actionview (master)]$ be ruby render_benchmark.rb
Warming up --------------------------------------
render 41.000 i/100ms
Calculating -------------------------------------
render 424.269 (± 3.5%) i/s - 2.132k in 5.031455s
```
Benchmark results (this branch):
```
[aaron@TC ~/g/r/actionview (speed-up-partials)]$ be ruby render_benchmark.rb
Warming up --------------------------------------
render 50.000 i/100ms
Calculating -------------------------------------
render 521.862 (± 3.8%) i/s - 2.650k in 5.085885s
```
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