Add specialized instructions eq{Cc,Ii}, jmp_{eq,ne}{Cc,Ii}, put_{a,b}_jmp, and push_b_decI

These are frequent pairs of instructions in the Ligretto and Trax
examples in iTasks.
11 jobs for master in 14 minutes and 8 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #51995
build

00:01:38

passed #51996
build-clang

00:01:17

passed #51998
build-wasm

00:00:28

passed #51997
build-windows

00:00:25

 
  Test Interpreter
passed #52001
benchmark-wasm

00:05:41

passed #51999
benchmark-x64

00:04:02

passed #52000
benchmark-x86

00:06:48

 
  Test Interworking
passed #52003
interworking-GraphCopy

00:00:37

passed #52004
interworking-GraphCopy-clang

00:01:01

passed #52002
interworking-Start

00:01:02

 
  Examples
passed #52005
examples

00:00:36