If a call to a builtin is generated at run-time (vs at snapshot time)
we don't need to tag the call/jump with relocation info, as the builtin
address will not change.

The only way to generate a builtin call at snapshot time is via

MacroAssembler::JumpToInstructionStream where we keep OFF_HEAP_TARGET.
The reloc info for builtin calls and jumps is set to NONE.

Bug: v8:6666
Change-Id: I9e8ad9f23481a2177e69352a56010084336402e7
Reviewed-on: https://chromium-review.googlesource.com/1105758
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53835}