Make range checks in semConv (#7164)

* Remove NaN/Inf/NegInf magic
* Make range checks in semConv
* fix the failing line
* fix `firstOrd` and `lastOrd`
* fix `localError`
* remove debug comment
* Cleanup, fix failing test
* make tests green

tests/misc/tconv.nim

@@ -0,0 +1,43 @@
+template reject(x) =
+    static: assert(not compiles(x))
+
+reject:
+    const x = int8(300)
+
+reject:
+    const x = int64(NaN)
+
+type
+    R = range[0..10]
+
+reject:
+    const x = R(11)
+
+reject:
+    const x = R(11.0)
+
+reject:
+    const x = R(NaN)
+
+reject:
+    const x = R(Inf)
+
+type
+    FloatRange = range[0'f..10'f]
+
+reject:
+    const x = FloatRange(-1'f)
+
+reject:
+    const x = FloatRange(-1)
+
+reject:
+    const x = FloatRange(NaN)
+
+block:
+    const x = float32(NaN)
+
+type E = enum a, b, c
+
+reject:
+    const e = E(4)