Build cctest while building V8

I noticed in a recent build that C++ files from cctest didn't start
compiling until after several slow non-parallel tasks such as running
mksnapshot and linking v8_for_testing. I don't see any reason that
cctest sources should wait for those tasks, so in this change I propose
adjusting the build dependencies for more parallelism.

Change-Id: I2472117c8555ac397fa1232954c8b699d6429d38
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3690170Reviewed-by: Nico Hartmann <nicohartmann@chromium.org>
Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
Cr-Commit-Position: refs/heads/main@{#80976}

test/cctest/BUILD.gn

@@ -16,7 +16,13 @@ v8_executable("cctest") {
 
   sources = [ "cctest.cc" ]
 
-  deps = [ ":cctest_sources" ]
+  deps = [
+    ":cctest_sources",
+    "../..:v8_for_testing",
+    "../..:v8_libbase",
+    "../..:v8_libplatform",
+    "../../tools/debug_helper:v8_debug_helper",
+  ]
 
   data_deps = [ "../../tools:v8_testrunner" ]
 
@@ -340,10 +346,6 @@ v8_source_set("cctest_sources") {
   public_deps = [
     ":cctest_headers",
     "..:common_test_headers",
-    "../..:v8_for_testing",
-    "../..:v8_libbase",
-    "../..:v8_libplatform",
-    "../../tools/debug_helper:v8_debug_helper",
     "//build/win:default_exe_manifest",
   ]