Revert "Fix JIT frame pushed at wrong stack position (regression)"

This reverts commit 4332554.

Author: dalehamel

support/ebpf/ruby_tracer.ebpf.c

@@ -469,25 +469,22 @@ static EBPF_INLINE ErrorCode walk_ruby_stack(
 
   if (in_jit) {
     if (rubyinfo->frame_pointers_enabled) {
-      // Only push a JIT frame if this is the leaf (first frame on the stack).
-      if (trace->num_frames == 0) {
-        ErrorCode jit_error =
-          push_ruby(&record->state, trace, RUBY_FRAME_TYPE_JIT, (u64)record->state.pc, 0, 0);
-        if (jit_error) {
-          return jit_error;
-        }
+      // Push a leaf JIT frame with the raw machine PC for perf-map symbolization.
+      ErrorCode jit_error =
+        push_ruby(&record->state, trace, RUBY_FRAME_TYPE_JIT, (u64)record->state.pc, 0, 0);
+      if (jit_error) {
+        return jit_error;
       }
+
     } else {
       // No frame pointers available: push a single dummy JIT frame.
       // Mark jit_detected so that cfuncs are pushed inline and end-of-stack uses
       // PROG_UNWIND_STOP instead of PROG_UNWIND_NATIVE.
       record->rubyUnwindState.jit_detected = true;
-      if (trace->num_frames == 0) {
-        ErrorCode jit_error =
-          push_ruby(&record->state, trace, RUBY_FRAME_TYPE_JIT, (u64)record->state.pc, 0, 0);
-        if (jit_error) {
-          return jit_error;
-        }
+      ErrorCode jit_error =
+        push_ruby(&record->state, trace, RUBY_FRAME_TYPE_JIT, (u64)record->state.pc, 0, 0);
+      if (jit_error) {
+        return jit_error;
       }
       in_jit = false;
     }