[TurboFan] Calculate precise ranges for bitwise-or with positive input ranges.

src/compiler/typer.h

Index: src/compiler/typer.h
diff --git a/src/compiler/typer.h b/src/compiler/typer.h
index 4c04ddb973b3404b85a2522fc9c75003041d0b10..f460a5e2367e45c7c6c12f1ba7f7af40624545c6 100644
--- a/src/compiler/typer.h
+++ b/src/compiler/typer.h
@@ -16,6 +16,15 @@ namespace compiler {
 class LazyTypeCache;
 
 
+struct IntType {
+  int32_t min;
+  int32_t max;
+  IntType(int32_t min, int32_t max) : min(min), max(max) {}
+};
+
+IntType JSBitwiseOrIntType(IntType lhs, IntType rhs);
+
+
 class Typer {
  public:
   Typer(Isolate* isolate, Graph* graph, MaybeHandle<Context> context);