Converted the 'invalid kind for firstOrd/lastOrd(XXX)' messages from …

…internal errors to fatal errors. (nim-lang#23443) (nim-lang#23447)

This fixes a nimsuggest crash when opening:
    beacon_chain/consensus_object_pools/blockchain_dag.nim
from the nimbus-eth2 project and many other .nim files (44 files, to be
precise) in the same project.

Replaces: nim-lang#23402 (cherry picked from
commit c934d59)

compiler/types.nim

@@ -831,11 +831,11 @@ proc firstOrd*(conf: ConfigRef; t: PType): Int128 =
     result = firstOrd(conf, lastSon(t))
   of tyOrdinal:
     if t.len > 0: result = firstOrd(conf, lastSon(t))
-    else: internalError(conf, "invalid kind for firstOrd(" & $t.kind & ')')
+    else: fatal(conf, unknownLineInfo, "invalid kind for firstOrd(" & $t.kind & ')')
   of tyUncheckedArray, tyCstring:
     result = Zero
   else:
-    internalError(conf, "invalid kind for firstOrd(" & $t.kind & ')')
+    fatal(conf, unknownLineInfo, "invalid kind for firstOrd(" & $t.kind & ')')
     result = Zero
 
 proc firstFloat*(t: PType): BiggestFloat =
@@ -890,11 +890,11 @@ proc lastOrd*(conf: ConfigRef; t: PType): Int128 =
   of tyProxy: result = Zero
   of tyOrdinal:
     if t.len > 0: result = lastOrd(conf, lastSon(t))
-    else: internalError(conf, "invalid kind for lastOrd(" & $t.kind & ')')
+    else: fatal(conf, unknownLineInfo, "invalid kind for lastOrd(" & $t.kind & ')')
   of tyUncheckedArray:
     result = Zero
   else:
-    internalError(conf, "invalid kind for lastOrd(" & $t.kind & ')')
+    fatal(conf, unknownLineInfo, "invalid kind for lastOrd(" & $t.kind & ')')
     result = Zero
 
 proc lastFloat*(t: PType): BiggestFloat =