Update base for Update on "[Executorch] Use temp allocator for allocating scratch memory"

This allows us to leverage temp memory allocator and if that allocator is caching allocator it reduces the allocaiton overhead.

Differential Revision: [D85532076](https://our.internmc.facebook.com/intern/diff/D85532076/)

[ghstack-poisoned]

Author: kimishpatel

extension/memory_allocator/test/cpu_caching_malloc_allocator_test.cpp

@@ -330,12 +330,8 @@ TEST_F(CPUCachingAllocatorTest, ResetFreesEverythingWhenOverMaxSize) {
   EXPECT_NE(p5, nullptr);
 
   // These should be new allocations, not cached ones
-  EXPECT_NE(p4, p1);
-  EXPECT_NE(p4, p2);
-  EXPECT_NE(p4, p3);
-  EXPECT_NE(p5, p1);
-  EXPECT_NE(p5, p2);
-  EXPECT_NE(p5, p3);
+  // However, system allocator might cache and return the same pointesr
+  // so we can't check for strict equality or inequality
 }
 
 TEST_F(CPUCachingAllocatorTest, ResetCachesWhenUnderMaxSize) {