Bring the code for %*ENV initialization to where it's run

No particular reason, but this code should only be run in a process
anyway, so why make a R:I method for it?

src/core.c/Rakudo/Internals.pm6

@@ -194,23 +194,6 @@ my class Rakudo::Internals {
         }
     }
 
-    method createENV() {
-        my $hash := nqp::hash;
-        my $iter := nqp::iterator(nqp::getenvhash);
-        nqp::while(
-          $iter,
-          nqp::bindkey(
-            $hash,
-            nqp::iterkey_s(nqp::shift($iter)),
-            nqp::assign(
-              nqp::p6scalarfromdesc(nqp::null),
-              val(nqp::box_s(nqp::iterval($iter),Str))
-            )
-          )
-        );
-        $hash
-    }
-
     # Helper method for prefix:<let>/prefix:<temp>, which really do the same
     # thing apart from where they store data.  Takes the IterationBuffer in
     # which to save data, the container to be inspected, and the type of op

src/core.c/core_prologue.pm6

@@ -75,7 +75,22 @@ my class Rakudo::Internals::IterationSet is repr('VMHash') {
 my constant $?NL = "\x0A";
 
 # Make sure we have an environment
-PROCESS::<%ENV> := Rakudo::Internals.createENV;
+PROCESS::<%ENV> := do {
+    my $env := nqp::hash;
+    my $iter := nqp::iterator(nqp::getenvhash);
+    nqp::while(
+      $iter,
+      nqp::bindkey(
+        $env,
+        nqp::iterkey_s(nqp::shift($iter)),
+        nqp::assign(
+          nqp::p6scalarfromdesc(nqp::null),
+          val(nqp::box_s(nqp::iterval($iter),Str))
+        )
+      )
+    );
+    nqp::p6bindattrinvres(nqp::create(Hash),Map,'$!storage',$env)
+}
 
 # This thread pool scheduler will be the default one.
 #?if !js