[gcc r14-214] Remove default constructor to nan_state.

[Aldy Hernandez <aldyh@gcc.gnu.org>]

https://gcc.gnu.org/g:a024ac7bca9b9de1d2e0c19d4bb11df293e27a7d

commit r14-214-ga024ac7bca9b9de1d2e0c19d4bb11df293e27a7d
Author: Aldy Hernandez <aldyh@redhat.com>
Date:   Tue Apr 25 10:10:39 2023 +0200

    Remove default constructor to nan_state.
    
    I think it's best to specify the default behavior of nan_state, since
    it's not obvious that nan_state() defaults to TRUE.  Also, this avoids
    the ugly nan_state(false, false) idiom.
    
    gcc/ChangeLog:
    
            * value-range.cc (frange::set): Adjust constructor.
            * value-range.h (nan_state::nan_state): Replace default
            constructor with one taking an argument.

Diff:
---
 gcc/value-range.cc |  3 +--
 gcc/value-range.h  | 13 +++++++------
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/gcc/value-range.cc b/gcc/value-range.cc
index 97162413727..26acba7b04b 100644
--- a/gcc/value-range.cc
+++ b/gcc/value-range.cc
@@ -426,8 +426,7 @@ frange::set (tree type,
 	     const REAL_VALUE_TYPE &min, const REAL_VALUE_TYPE &max,
 	     value_range_kind kind)
 {
-  nan_state nan;
-  set (type, min, max, nan, kind);
+  set (type, min, max, nan_state (true), kind);
 }
 
 void
diff --git a/gcc/value-range.h b/gcc/value-range.h
index 33ef3b5b8d8..d2a275958c8 100644
--- a/gcc/value-range.h
+++ b/gcc/value-range.h
@@ -274,12 +274,12 @@ public:
   virtual void accept (const vrange_visitor &v) const override;
 };
 
-// The NAN state as an opaque object.  The default constructor is +-NAN.
+// The NAN state as an opaque object.
 
 class nan_state
 {
 public:
-  nan_state ();
+  nan_state (bool);
   nan_state (bool pos_nan, bool neg_nan);
   bool neg_p () const;
   bool pos_p () const;
@@ -288,13 +288,14 @@ private:
   bool m_neg_nan;
 };
 
-// Default constructor initializing the object to +-NAN.
+// Set NAN state to +-NAN if NAN_P is true.  Otherwise set NAN state
+// to false.
 
 inline
-nan_state::nan_state ()
+nan_state::nan_state (bool nan_p)
 {
-  m_pos_nan = true;
-  m_neg_nan = true;
+  m_pos_nan = nan_p;
+  m_neg_nan = nan_p;
 }
 
 // Constructor initializing the object to +NAN if POS_NAN is set, -NAN