[lite] Change feedback allocation budget to 1024

Lower the interrupt budget so we allocate feedback vectors earlier.
The earlier budget of 2048 causes ~3% regressions in speedometer. From earlier
experiments, there was no noticeable memory savings between 2048 and 1024.


Bug: v8:8394
Change-Id: I6327e22c4df60c262420975f2e204cdbacefb485
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1547662Reviewed-by: Dan Elphick <delphick@chromium.org>
Commit-Queue: Mythri Alle <mythria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60559}

src/flag-definitions.h

@@ -370,7 +370,7 @@ DEFINE_INT(interrupt_budget, 144 * KB,
 #undef FLAG
 #define FLAG FLAG_FULL
 
-DEFINE_INT(budget_for_feedback_vector_allocation, 2 * KB,
+DEFINE_INT(budget_for_feedback_vector_allocation, 1 * KB,
            "The budget in amount of bytecode executed by a function before we "
            "decide to allocate feedback vectors")
 DEFINE_BOOL(lazy_feedback_allocation, false, "Allocate feedback vectors lazily")