Blog post: PDX Summit Recap.
Regen'd website.
Fix typo
Merge pull request #2218 from adzankich/io19_typo

Fix typo in io19.rb
Remove exports for symbols that are available for libc_nonshared

Apperently on RHEL / CentOS 5.9 this breaks the compile since these
symbols are exported there. Also checked against Ubuntu and the symbols
are available there too.

Fixes #2217
Return empty Hash if there are no coverage results.
Updated CI specs to RubySpec d906aaf0.
Ivar reading only reads memory and doesn't modify
Print class name we read ivar from in JIT debugging

Make it easier to see what the class is we guard the ivar read against.
Setup self class for block based on creator info

This allows the JIT to inline ivar reads inside inlined blocks, for
example in cases like this:

def foo
  ary.each {|e| e == @bar }
end
Allow for compiled blocks to also have a receiver class

Before the additional data was either a block environment or a receiver
class, but having a receiver class is also useful for compiling blocks.
This matters for example for inlining instance variable reads if just a
block is compiled.

Improves benchmark/tiers/0/bm_vm1_ivar.rb significantly:

Before:
=== bin/rbx ===
  ivar read 58492061.6 (±3.0%) i/s -  289205872 in   4.948913s
   ivar set 41165744.5 (±2.6%) i/s -  204915000 in   4.982051s

After:
=== bin/rbx ===
  ivar read 266371814.2 (±5.6%) i/s - 1283690000 in   4.836606s
   ivar set 224551559.4 (±4.0%) i/s - 1110346272 in   4.953298s
Remove unused extra_ field
Optimize performance of Kernel#rand
Convert a bunch of tier1 benchmarks to Benchmark.ips
Add a blog post for profiling JIT-ted code with OProfile
Merge pull request #2216 from ryoqun/oprofile-blog-post-final

Add a blog post for profiling JIT-ted code with OProfile
Sort CompiledCode init code and use LLVM guard
Fix mis-aligned text
Regen'd website.
Emit block in uncommon exit path when inside an inlined block