Revert "[turbofan] Weakening of types must weaken ranges inside unions."

src/types.h

Index: src/types.h
diff --git a/src/types.h b/src/types.h
index aafaf07fb5ddc054378ea7a53be68545bb2006ef..1d506d0ca2eba3a2fa898ebde2530f20d5e421ee 100644
--- a/src/types.h
+++ b/src/types.h
@@ -464,11 +464,6 @@ class TypeImpl : public Config::Base {
   double Min();
   double Max();
 
-  // Extracts a range from the type. If the type is a range, it just
-  // returns it; if it is a union, it returns the range component.
-  // Note that it does not contain range for constants.
-  RangeType* GetRange();
-
   int NumClasses();
   int NumConstants();
 
@@ -556,6 +551,7 @@ class TypeImpl : public Config::Base {
   static bool Contains(RangeType* lhs, RangeType* rhs);
   static bool Contains(RangeType* range, i::Object* val);
 
+  RangeType* GetRange();
   static int UpdateRange(
       RangeHandle type, UnionHandle result, int size, Region* region);