[jumbo] also exclude test-bytecode-generator.cc from cctest jumbo builds

This caused trouble for my downstream CI tests, even though it builds
successfully in the canonical v8 tree.  To be investigated properly
later.

Bug: chromium:746958
Change-Id: I180a5ecc51051e4eb6617180ccba787ff80bcf45
Reviewed-on: https://chromium-review.googlesource.com/682695Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Mostyn Bramley-Moore <mostynb@opera.com>
Cr-Commit-Position: refs/heads/master@{#48151}

test/cctest/BUILD.gn

@@ -243,6 +243,7 @@ v8_source_set("cctest_sources") {
       # files, and include them in jumbo compilation units.
       "interpreter/bytecode-expectations-printer.cc",
       "interpreter/bytecode-expectations-printer.h",
+      "interpreter/test-bytecode-generator.cc",
       "test-api.cc",
       "test-api.h",
     ]