Fix double-long conversion.

Author: FeepingCreature

src/backend/llvm.nt

@@ -997,7 +997,7 @@ class LLVMBackendFunction : BackendFunction, PhiCapable {
         auto def = this.regDefines.get(reg).case(:notFound: die);
         auto from = def.type;
         bool isInt(BackendType type) {
-            return !!type.instanceOf(BackendIntType);
+            return type.instanceOf(BackendIntType) || type.instanceOf(BackendLongType);
         }
         bool isFloat(BackendType type) {
             return type.instanceOf(BackendFloatType) || type.instanceOf(BackendDoubleType);

src/neat/expr.nt

@@ -953,7 +953,8 @@ class CastExpr : Expression
         }
         if (type.instanceOf(Float) && this.target.instanceOf(Integer) ||
             type.instanceOf(Double) && this.target.instanceOf(Integer) ||
-            type.instanceOf(Double) && this.target.instanceOf(Float))
+            type.instanceOf(Double) && this.target.instanceOf(Float) ||
+            type.instanceOf(Double) && this.target.instanceOf(Long))
         {
             return generator.fun.convert(value, target);
         }

test/runnable/floattest.nt

@@ -10,4 +10,6 @@ void main() {
     float h = -3.5;
     assert(0 - 4f == -4.0f);
     assert(100_000f == 100_000.0f);
+    assert(cast(int) 1234.0f == 1234);
+    assert(cast(long) 1234.0 == 1234);
 }