PPC: skip test-bytecode-generator/WideRegisters

R=leszeks@chromium.org, rmcilroy@chromium.org

Bug: v8:8766
Change-Id: I85ac658dddffaea69f64864185e87db2fdb2f90f
Reviewed-on: https://chromium-review.googlesource.com/c/1450132Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#59304}

test/cctest/cctest.status

@@ -427,6 +427,11 @@
 
 }],  # 'arch == ppc or arch == ppc64 or arch == s390 or arch == s390x'
 
+['arch == ppc64', {
+  # https://crbug.com/v8/8766
+  'test-bytecode-generator/WideRegisters': [SKIP],
+}],
+
 ##############################################################################
 ['variant == stress_incremental_marking', {
   'test-heap-profiler/SamplingHeapProfiler': [SKIP],