[DEV-7198] Create a "yield" template

Create a "yield" and add backwards compatibility for the macro of the
same name. This is one of 2 macros that need to be replaced so we do not
have to worry about them with the new compiler.

core/base.xml

@@ -216,5 +216,14 @@
       <warning>Ignored block!</warning>
     </template>
   </section>
+
+  <template name="_yield_"
+            desc="Final scalar result provided to caller">
+    <param name="@values@" desc="Yield calculation" />
+
+    <rate yields="___yield" local="true">
+      <param-copy name="@values@" />
+    </rate>
+  </template>
 </package>
 

src/current/include/preproc/macros.xsl

@@ -348,13 +348,14 @@
 
 
 <!--
-  lv:yield is simply another rate block with a special name that is recognized
-  by the linker
+  wrapper around `<t:yield />`
 -->
 <template match="lv:yield" mode="preproc:macros" priority="5">
-  <lv:rate yields="___yield" local="true">
-    <apply-templates mode="preproc:macros" />
-  </lv:rate>
+  <t:yield>
+    <copy-of select="@*" />
+
+    <apply-templates mode="preproc:expand" />
+  </t:yield>
 </template>