Bug 1685260: Add TDZCheckCache. r=yulia, a=RyanVM

Differential Revision: https://phabricator.services.mozilla.com/D100883

js/src/frontend/OptionalEmitter.cpp

@@ -16,7 +16,7 @@ using namespace js;
 using namespace js::frontend;
 
 OptionalEmitter::OptionalEmitter(BytecodeEmitter* bce, int32_t initialDepth)
-    : bce_(bce), initialDepth_(initialDepth) {}
+    : bce_(bce), tdzCache_(bce), initialDepth_(initialDepth) {}
 
 bool OptionalEmitter::emitJumpShortCircuit() {
   MOZ_ASSERT(state_ == State::Start || state_ == State::ShortCircuit ||

js/src/frontend/OptionalEmitter.h

@@ -9,6 +9,7 @@
 
 #include "mozilla/Attributes.h"
 #include "frontend/IfEmitter.h"  // IfEmitter, InternalIfEmitter, CondEmitter
+#include "frontend/TDZCheckCache.h"
 
 namespace js {
 namespace frontend {
@@ -146,6 +147,8 @@ class MOZ_RAII OptionalEmitter {
  private:
   BytecodeEmitter* bce_;
 
+  TDZCheckCache tdzCache_;
+
   // jumptarget for ShortCircuiting code, which has null or undefined values
   JumpList jumpShortCircuit_;