Fix more keyword separation issues

This fixes instance_exec and similar methods. It also fixes
Enumerator::Yielder#yield, rb_yield_block, and a couple of cases
with Proc#{<<,>>}.

This support requires the addition of rb_yield_values_kw, similar to
rb_yield_values2, for passing the keyword flag.

Unlike earlier attempts at this, this does not modify the rb_block_call_func
type or add a separate function type.  The functions of type
rb_block_call_func are called by Ruby with a separate VM frame, and we can
get the keyword flag information from the VM frame flags, so it doesn't need
to be passed as a function argument.

These changes require the following VM functions accept a keyword flag:

* vm_yield_with_cref
* vm_yield
* vm_yield_with_block

1 files changed, 3 insertions, 9 deletions

diff --git a/test/ruby/test_proc.rb b/test/ruby/test_proc.rb
index b7d644345d..467bbf5925 100644
--- a/test/ruby/test_proc.rb
+++ b/test/ruby/test_proc.rb
@@ -1552,9 +1552,7 @@ class TestProcKeywords < Test::Unit::TestCase
     assert_warn(/The last argument is used as the keyword parameter.*for method/m) do
       assert_equal(1, (f << g).call(a: 3)[:a])
     end
-    assert_warn(/The last argument is used as the keyword parameter.*for method/m) do
-      assert_equal(2, (f >> g).call(a: 3)[:a])
-    end
+    assert_equal(2, (f >> g).call(a: 3)[:a])
     assert_warn(/The last argument is used as the keyword parameter.*for method/m) do
       assert_equal(1, (f << g).call({a: 3})[:a])
     end
@@ -1574,9 +1572,7 @@ class TestProcKeywords < Test::Unit::TestCase
     assert_warn(/The keyword argument is passed as the last hash parameter.*The last argument is used as the keyword parameter.*for method/m) do
       assert_equal(1, (f << g).call(**{})[:a])
     end
-    assert_warn(/The last argument is used as the keyword parameter.*for method/m) do
-      assert_equal(2, (f >> g).call(**{})[:a])
-    end
+    assert_equal(2, (f >> g).call(**{})[:a])
   end
 
   def test_compose_keywords_non_proc
@@ -1632,9 +1628,7 @@ class TestProcKeywords < Test::Unit::TestCase
     assert_warn(/The last argument is used as the keyword parameter.*for `call'/m) do
       assert_equal(2, (g << f).call(a: 3)[:a])
     end
-    assert_warn(/The last argument is used as the keyword parameter.*for `call'/m) do
-      assert_equal(1, (g >> f).call(a: 3)[:a])
-    end
+    assert_equal(1, (g >> f).call(a: 3)[:a])
     assert_warn(/The last argument is used as the keyword parameter.*for `call'/m) do
       assert_equal(2, (g << f).call({a: 3})[:a])
     end