Alias init to initializer

Matches change in D2 runtime intended to avoid confusion with built-in
`T.init`

relnotes/init.deprecation.md

@@ -0,0 +1,5 @@
+### ClassInfo.init is deprecated, renamed to `initializer`
+
+This change matches recent deprecation in D2 upstream druntime and is intended
+to eliminate confusion between built-in `T.init` property of all types and
+member function of `ClassInfo` with the same name.

relnotes/init.feature.md

@@ -0,0 +1,8 @@
+### `ClassInfo.init()` is also available as `initializer`
+
+This change matches recent deprecation in D2 upstream druntime and is intended
+to eliminate confusion between built-in `T.init` property of all types and
+member function of `ClassInfo` with the same name.
+
+Now tangort provides both names so that applications doing transition to D2 can
+make a switch without breaking D1 build.

src/object.d

@@ -297,6 +297,8 @@ class ClassInfo : Object
     byte[]      init;           /** class static initializer
                                  * (init.length gives size in bytes of class)
                                  */
+    byte[] initializer ( ) { return init; }
+
     char[]      name;           /// class name
     void*[]     vtbl;           /// virtual function pointer table
     Interface[] interfaces;     /// interfaces this class implements
@@ -440,6 +442,8 @@ class TypeInfo
     /// Return default initializer, null if default initialize to 0
     void[] init() { return null; }
 
+    void[] initializer() { return init(); }
+
     /// Get flags for type: 1 means GC should scan for pointers
     uint flags() { return 0; }
 
@@ -508,7 +512,9 @@ class TypeInfo_Typedef : TypeInfo
     override TypeInfo next() { return base; }
     override uint flags() { return base.flags(); }
     override PointerMap pointermap() { return base.pointermap(); }
+
     override void[] init() { return m_init.length ? m_init : base.init(); }
+    override void[] initializer() { return init(); }
 
     size_t talign() { return base.talign(); }
 
@@ -760,6 +766,8 @@ class TypeInfo_StaticArray : TypeInfo
     }
 
     override void[] init() { return value.init(); }
+    override void[] initializer() { return init(); }
+
     override TypeInfo next() { return value; }
     override uint flags() { return value.flags(); }
 
@@ -1176,6 +1184,7 @@ class TypeInfo_Struct : TypeInfo
     }
 
     override void[] init() { return m_init; }
+    override void[] initializer() { return init(); }
 
     override uint flags() { return m_flags; }
 

src/rt/lifetime.d

@@ -254,7 +254,7 @@ extern(C) array_t _d_newarrayiT(TypeInfo ti, size_t length)
         result = array_t.init;
     else
     {
-        auto initializer = ti.next.init();
+        auto initializer = ti.next.initializer();
         auto isize = initializer.length;
         auto q = initializer.ptr;
         version (D_InlineAsm_X86)
@@ -788,7 +788,7 @@ body
 {
     byte* newdata;
     size_t sizeelem = ti.next.tsize();
-    void[] initializer = ti.next.init();
+    void[] initializer = ti.next.initializer();
     size_t initsize = initializer.length;
 
     assert(sizeelem);