replacing most uses of HashMap with LinkedHashMap. This will reduce (if not…

replacing most uses of HashMap with LinkedHashMap. This will reduce (if not eliminate) undeterminism in the compilation.
Copied LinkedHashMap implementation to local so that I can implement encode/decode and other necessary methods
13 jobs from master in 23 minutes and 53 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
passed #1665
test:cargo:api

01:53

passed #1667
test:cargo:compiler

02:10

passed #1666
test:cargo:ir

01:50

passed #1668
test:cargo:runtime

02:41

failed #1670
testjit:binops

01:35

failed #1671
testjit:cmpops

01:35

failed #1672
testjit:controlflow

01:32

failed #1673
testjit:convops

01:30

failed #1674
testjit:double

01:35

failed #1675
testjit:memops

01:32

failed #1669
testjit:milestones

01:32

failed #1676
testjit:otherops

01:32

passed #1677
testjit:rpython

02:50