fp add with two constants

currently mov constant as imm to a GPR, then mov from GPR
to xmm. A better approach should be put the immediate in memroy,
and load it
13 jobs from master in 24 minutes and 35 seconds (queued for 5 seconds)
Status Job ID Name Coverage
  Test
passed #1184
test:cargo:api

01:48

passed #1186
test:cargo:compiler

01:59

passed #1185
test:cargo:ir

01:44

passed #1187
test:cargo:runtime

02:34

passed #1189
testjit:binops

01:45

passed #1190
testjit:cmpops

01:45

passed #1191
testjit:controlflow

01:45

passed #1192
testjit:convops

01:43

failed #1193
testjit:double

01:32

passed #1194
testjit:memops

01:44

passed #1188
testjit:milestones

01:44

passed #1195
testjit:otherops

01:46

passed #1196
testjit:rpython

02:40