Rename builtins/builtins-debug-gen.cc and move to mksnapshot

Bug: v8:6055
Change-Id: Ib14dcef7f30bab88fad92b1a7329163beea50503
Reviewed-on: https://chromium-review.googlesource.com/511682Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Loo Rong Jie <loorongjie@gmail.com>
Cr-Commit-Position: refs/heads/master@{#45473}

BUILD.gn

@@ -906,6 +906,7 @@ v8_source_set("v8_builtins_generators") {
     "src/builtins/builtins-constructor.h",
     "src/builtins/builtins-conversion-gen.cc",
     "src/builtins/builtins-date-gen.cc",
+    "src/builtins/builtins-debug-gen.cc",
     "src/builtins/builtins-forin-gen.cc",
     "src/builtins/builtins-forin-gen.h",
     "src/builtins/builtins-function-gen.cc",
@@ -1142,7 +1143,6 @@ v8_source_set("v8_base") {
     "src/builtins/builtins-constructor.h",
     "src/builtins/builtins-dataview.cc",
     "src/builtins/builtins-date.cc",
-    "src/builtins/builtins-debug.cc",
     "src/builtins/builtins-definitions.h",
     "src/builtins/builtins-descriptors.h",
     "src/builtins/builtins-error.cc",

src/v8.gyp

@@ -186,6 +186,7 @@
         'builtins/builtins-constructor.h',
         'builtins/builtins-conversion-gen.cc',
         'builtins/builtins-date-gen.cc',
+        'builtins/builtins-debug-gen.cc',
         'builtins/builtins-forin-gen.cc',
         'builtins/builtins-forin-gen.h',
         'builtins/builtins-function-gen.cc',
@@ -631,7 +632,6 @@
         'builtins/builtins-constructor.h',
         'builtins/builtins-dataview.cc',
         'builtins/builtins-date.cc',
-        'builtins/builtins-debug.cc',
         'builtins/builtins-definitions.h',
         'builtins/builtins-descriptors.h',
         'builtins/builtins-error.cc',