https://git.ruby-lang.org/ruby.git/commit/?id=5f4e784233

From 5f4e78423337662d0fc6cccf63a0fc8835715fae Mon Sep 17 00:00:00 2001
From: Jeremy Evans <code@j...>
Date: Tue, 10 Aug 2021 14:46:17 -0700
Subject: Avoid unnecessary conditional

All frames should be either iseq frames or cfunc frames.  Use a
VM assert instead of a conditional to check for a cfunc frame if
the current frame is not an iseq frame.
---
 vm_backtrace.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/vm_backtrace.c b/vm_backtrace.c
index 27e108af61..8cb4881e15 100644
--- a/vm_backtrace.c
+++ b/vm_backtrace.c
@@ -648,7 +648,8 @@ rb_ec_partial_backtrace_object(const rb_execution_context_t *ec, long start_fram https://github.com/ruby/ruby/blob/trunk/vm_backtrace.c#L648
                 }
             }
         }
-        else if (RUBYVM_CFUNC_FRAME_P(cfp)) {
+        else {
+            VM_ASSERT(RUBYVM_CFUNC_FRAME_P(cfp));
             if (start_frame > 0) {
                 start_frame--;
             }
@@ -917,7 +918,8 @@ backtrace_each(const rb_execution_context_t *ec, https://github.com/ruby/ruby/blob/trunk/vm_backtrace.c#L918
                 iter_iseq(arg, cfp);
             }
         }
-        else if (RUBYVM_CFUNC_FRAME_P(cfp)) {
+        else {
+            VM_ASSERT(RUBYVM_CFUNC_FRAME_P(cfp));
             const rb_callable_method_entry_t *me = rb_vm_frame_method_entry(cfp);
             ID mid = me->def->original_id;
 
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