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.

1 files changed, 12 insertions, 0 deletions

diff --git a/gcc/vec.h b/gcc/vec.h
index d048fa5..1abe777 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; }