[pull] master from ruby:master #308
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No point taking the panic risks with RefCell when most fields in it are already in a Cell. Put `iseq` in a Cell and we no longer need the wrapping. Saves memory, too.
* ZJIT: Add stats for cfuncs that are not optimized
* ZJIT: Add IncrCounterPtr HIR instead
From `lobsters`
```
Top-20 Unoptimized C functions (73.0% of total 15,276,688):
Kernel#is_a?: 2,052,363 (13.4%)
Class#current: 1,892,623 (12.4%)
String#to_s: 975,973 ( 6.4%)
Hash#key?: 677,623 ( 4.4%)
String#empty?: 636,468 ( 4.2%)
TrueClass#===: 457,232 ( 3.0%)
Hash#[]=: 455,908 ( 3.0%)
FalseClass#===: 448,798 ( 2.9%)
ActiveSupport::OrderedOptions#_get: 377,468 ( 2.5%)
Kernel#kind_of?: 339,551 ( 2.2%)
Kernel#dup: 329,371 ( 2.2%)
String#==: 324,286 ( 2.1%)
String#include?: 297,528 ( 1.9%)
Hash#[]: 294,561 ( 1.9%)
Array#include?: 287,145 ( 1.9%)
Kernel#block_given?: 283,633 ( 1.9%)
BasicObject#!=: 278,874 ( 1.8%)
Hash#delete: 250,951 ( 1.6%)
Set#include?: 246,447 ( 1.6%)
NilClass#===: 242,776 ( 1.6%)
```
From `liquid-render`
```
Top-20 Unoptimized C functions (99.8% of total 5,195,549):
Hash#key?: 2,459,048 (47.3%)
String#to_s: 1,119,758 (21.6%)
Set#include?: 799,469 (15.4%)
Kernel#is_a?: 214,223 ( 4.1%)
Integer#<<: 171,073 ( 3.3%)
Integer#/: 127,622 ( 2.5%)
CGI::EscapeExt#escapeHTML: 56,971 ( 1.1%)
Regexp#===: 50,008 ( 1.0%)
String#empty?: 43,990 ( 0.8%)
String#===: 36,838 ( 0.7%)
String#==: 21,309 ( 0.4%)
Time#strftime: 21,251 ( 0.4%)
String#strip: 15,271 ( 0.3%)
String#scan: 13,753 ( 0.3%)
String#+@: 12,603 ( 0.2%)
Array#include?: 8,059 ( 0.2%)
String#+: 5,295 ( 0.1%)
String#dup: 4,606 ( 0.1%)
String#-@: 3,213 ( 0.1%)
Class#generate: 3,011 ( 0.1%)
```
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