From b38648bf7b2cc3c377745a6eede7b79d6096793c Mon Sep 17 00:00:00 2001
From: Cameron Kaiser <classilla@floodgap.com>
Date: Thu, 14 Jun 2018 21:32:53 -0700
Subject: [PATCH] #500: M1464829

---
 js/src/jit/JitFrameIterator.h | 2 --
 js/src/jit/JitFrames.cpp      | 4 +---
 2 files changed, 1 insertion(+), 5 deletions(-)

diff --git a/js/src/jit/JitFrameIterator.h b/js/src/jit/JitFrameIterator.h
index 61fbdb6f8..dce63665e 100644
--- a/js/src/jit/JitFrameIterator.h
+++ b/js/src/jit/JitFrameIterator.h
@@ -344,9 +344,7 @@ class RInstructionResults
 
     bool init(JSContext* cx, uint32_t numResults);
     bool isInitialized() const;
-#ifdef DEBUG
     size_t length() const;
-#endif
 
     JitFrameLayout* frame() const;
 
diff --git a/js/src/jit/JitFrames.cpp b/js/src/jit/JitFrames.cpp
index 8a5a495d0..b92565885 100644
--- a/js/src/jit/JitFrames.cpp
+++ b/js/src/jit/JitFrames.cpp
@@ -1753,13 +1753,11 @@ RInstructionResults::isInitialized() const
     return initialized_;
 }
 
-#ifdef DEBUG
 size_t
 RInstructionResults::length() const
 {
     return results_->length();
 }
-#endif
 
 JitFrameLayout*
 RInstructionResults::frame() const
@@ -2227,7 +2225,7 @@ SnapshotIterator::initInstructionResults(MaybeReadFallback& fallback)
     }
 
     MOZ_ASSERT(results->isInitialized());
-    MOZ_ASSERT(results->length() == recover_.numInstructions() - 1);
+    MOZ_RELEASE_ASSERT(results->length() == recover_.numInstructions() - 1);
     instructionResults_ = results;
     return true;
 }