GetSpellInfo was replaced with C_Spell.GetSpellInfo

It returns information differently - here is an example for Divine Shield.

/dump GellSpellInfo(642)
Dump: value=GetSpellInfo(642)
[1]="Divine Shield",
[3]=524354,
[4]=0,
[5]=0,
[6]=0,
[7]=642,
[8]=524354

/dump C_Spell.GetSpellInfo(642)
Dump: value=C_Spell.GetSpellInfo(642)
[1]={
castTime=0,
name="Divine Shield",
minRange=0,
originalIconID=524354,
icondID=524354,
maxRange=0,
spellID=642
}