[test] Fix tests to work with lazy feedback allocation

Bug: v8:8394
Change-Id: I593393f30eaa6e87cef52d8b8883010e229cb12a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1609540
Auto-Submit: Mythri Alle <mythria@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Mythri Alle <mythria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61448}

test/cctest/test-compiler.cc

@@ -370,9 +370,9 @@ TEST(FeedbackVectorUnaffectedByScopeChanges) {
 
   CompileRun("morphing_call();");
 
-  // Now a feedback vector is allocated.
+  // Now a feedback vector / closure feedback cell array is allocated.
   CHECK(f->shared()->is_compiled());
-  CHECK(!f->feedback_vector()->is_empty());
+  CHECK(f->has_feedback_vector() || f->has_closure_feedback_cell_array());
 }
 
 // Test that optimized code for different closures is actually shared.

test/mjsunit/regress/regress-crbug-319860.js

@@ -36,6 +36,7 @@ function read(a, index) {
   return result;
 }
 
+%PrepareFunctionForOptimization(read);
 var a = new Int8Array(0x2000001);
 read(a, 0);
 read(a, 0);