[gcc r13-2293] vec: Add array_slice constructors from non-const and gc vectors

[Martin Jambor <jamborm@gcc.gnu.org>]

https://gcc.gnu.org/g:15433c214df295f2281a90fcf283355b21beca0e

commit r13-2293-g15433c214df295f2281a90fcf283355b21beca0e
Author: Martin Jambor <mjambor@suse.cz>
Date:   Tue Aug 30 18:50:35 2022 +0200

    vec: Add array_slice constructors from non-const and gc vectors
    
    This patch adds constructors of array_slice that are required to
    create them from non-const (heap or auto) vectors or from GC vectors.
    
    gcc/ChangeLog:
    
    2022-08-08  Martin Jambor  <mjambor@suse.cz>
    
            * vec.h (array_slice): Add constructors for non-const reference to
            heap vector and pointers to heap vectors.

Diff:
---
 gcc/vec.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/gcc/vec.h b/gcc/vec.h
index d048fa54ce8..1abe777baeb 100644
--- a/gcc/vec.h
+++ b/gcc/vec.h
@@ -2267,6 +2267,18 @@ public:
   array_slice (const vec<OtherT> &v)
     : m_base (v.address ()), m_size (v.length ()) {}
 
+  template<typename OtherT>
+  array_slice (vec<OtherT> &v)
+    : m_base (v.address ()), m_size (v.length ()) {}
+
+  template<typename OtherT>
+  array_slice (const vec<OtherT, va_gc> *v)
+    : m_base (v ? v->address () : nullptr), m_size (v ? v->length () : 0) {}
+
+  template<typename OtherT>
+  array_slice (vec<OtherT, va_gc> *v)
+    : m_base (v ? v->address () : nullptr), m_size (v ? v->length () : 0) {}
+
   iterator begin () { return m_base; }
   iterator end () { return m_base + m_size; }