ZJIT: Compile toregexp (#14200)

`toregexp` is fairly similar to `concatstrings`, so this commit extracts
a helper for pushing and popping operands on the native stack.

There's probably opportunity to move some of this into lir (e.g. Alan
suggested a push_many that could use STP on ARM to push 2 at a time),
but I might save that for another day.

1 files changed, 8 insertions, 0 deletions

diff --git a/test/ruby/test_zjit.rb b/test/ruby/test_zjit.rb
index 96ac99b6db..e18333a58f 100644
--- a/test/ruby/test_zjit.rb
+++ b/test/ruby/test_zjit.rb
@@ -1847,6 +1847,14 @@ class TestZJIT < Test::Unit::TestCase
     }, insns: [:concatstrings]
   end
 
+  def test_regexp_interpolation
+    assert_compiles '/123/', %q{
+      def test = /#{1}#{2}#{3}/
+
+      test
+    }, insns: [:toregexp]
+  end
+
   private
 
   # Assert that every method call in `test_script` can be compiled by ZJIT