This CL ensures that the following builtins preserve
the kRootRegister (ebx):

InterpreterPushUndefinedAndArgsThenCall
InterpreterPushArgsThenCallWithFinalSpread
InterpreterPushArgsThenConstruct
InterpreterPushArgsThenConstructArrayFunction
InterpreterPushZeroAndArgsAndReturnAddress
InterpreterPushArgsThenConstructWithFinalSpread

Bug: v8:6666
Change-Id: I026654b981276c7d435c18c9eedef3f5d33b6533
Reviewed-on: https://chromium-review.googlesource.com/1233754Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56082}