Bug 1635878 - Transpile LoadTypedArrayLength. r=jandem

Depends on D74138

Differential Revision: https://phabricator.services.mozilla.com/D74140

js/src/jit/CacheIROps.yaml

@@ -906,7 +906,7 @@
 
 - name: LoadTypedArrayLengthResult
   shared: true
-  transpile: false
+  transpile: true
   args:
     obj: ObjId
 

js/src/jit/WarpCacheIRTranspiler.cpp

@@ -416,6 +416,16 @@ bool WarpCacheIRTranspiler::emitLoadInt32ArrayLengthResult(ObjOperandId objId) {
   return true;
 }
 
+bool WarpCacheIRTranspiler::emitLoadTypedArrayLengthResult(ObjOperandId objId) {
+  MDefinition* obj = getOperand(objId);
+
+  auto* length = MTypedArrayLength::New(alloc(), obj);
+  add(length);
+
+  pushResult(length);
+  return true;
+}
+
 bool WarpCacheIRTranspiler::emitLoadStringLengthResult(StringOperandId strId) {
   MDefinition* str = getOperand(strId);