--- a/js/src/jit/Ion.cpp
+++ b/js/src/jit/Ion.cpp
@@ -98,81 +98,45 @@ jit::GetJitContext()
 }
 
 JitContext*
 jit::MaybeGetJitContext()
 {
     return CurrentJitContext();
 }
 
-JitContext::JitContext(JSContext* cx, TempAllocator* temp)
-  : cx(cx),
-    temp(temp),
-    runtime(CompileRuntime::get(cx->runtime())),
-    compartment(CompileCompartment::get(cx->compartment())),
-    prev_(CurrentJitContext()),
-    assemblerCount_(0)
-{
-    SetJitContext(this);
-}
-
 JitContext::JitContext(CompileRuntime* rt, CompileCompartment* comp, TempAllocator* temp)
   : cx(nullptr),
     temp(temp),
     runtime(rt),
     compartment(comp),
     prev_(CurrentJitContext()),
     assemblerCount_(0)
 {
     SetJitContext(this);
 }
 
-JitContext::JitContext(CompileRuntime* rt)
-  : cx(nullptr),
-    temp(nullptr),
-    runtime(rt),
-    compartment(nullptr),
+JitContext::JitContext(JSContext* cx, TempAllocator* temp)
+  : cx(cx),
+    temp(temp),
+    runtime(CompileRuntime::get(cx->runtime())),
+    compartment(CompileCompartment::get(cx->compartment())),
     prev_(CurrentJitContext()),
     assemblerCount_(0)
 {
     SetJitContext(this);
 }
 
 JitContext::JitContext(TempAllocator* temp)
-  : cx(nullptr),
-    temp(temp),
-    runtime(nullptr),
-    compartment(nullptr),
-    prev_(CurrentJitContext()),
-    assemblerCount_(0)
-{
-    SetJitContext(this);
-}
-
-JitContext::JitContext(CompileRuntime* rt, TempAllocator* temp)
-  : cx(nullptr),
-    temp(temp),
-    runtime(rt),
-    compartment(nullptr),
-    prev_(CurrentJitContext()),
-    assemblerCount_(0)
-{
-    SetJitContext(this);
-}
+  : JitContext(nullptr, nullptr, temp)
+{}
 
 JitContext::JitContext()
-  : cx(nullptr),
-    temp(nullptr),
-    runtime(nullptr),
-    compartment(nullptr),
-    prev_(CurrentJitContext()),
-    assemblerCount_(0)
-{
-    SetJitContext(this);
-}
+  : JitContext(nullptr, nullptr, nullptr)
+{}
 
 JitContext::~JitContext()
 {
     SetJitContext(prev_);
 }
 
 bool
 jit::InitializeIon()

--- a/js/src/jit/Ion.h
+++ b/js/src/jit/Ion.h
@@ -52,18 +52,16 @@ static_assert(sizeof(AbortReasonOr<bool>
 // JSContext, either of which may be nullptr, and the active compartment, which
 // will not be nullptr.
 
 class JitContext
 {
   public:
     JitContext(JSContext* cx, TempAllocator* temp);
     JitContext(CompileRuntime* rt, CompileCompartment* comp, TempAllocator* temp);
-    JitContext(CompileRuntime* rt, TempAllocator* temp);
-    explicit JitContext(CompileRuntime* rt);
     explicit JitContext(TempAllocator* temp);
     JitContext();
     ~JitContext();
 
     // Running context when executing on the main thread. Not available during
     // compilation.
     JSContext* cx;