X87: disable test-gap-resolver/FuzzResolver test case for x87.

  The reason:
  In CreateRandomOperand(), It used the register index 1 for ExplicitOperand(LocationOperand::REGISTER, rep,
  GetRegisterCode(rep, 1)).

  For x87 turbofan compiler, there's only 1 allocatable Float/Double register, i.e.: register index 0. the
  GetRegisterCode(rep, 1) in ExplicitOperand() always return false when rep is MachineRepresentation::kFloat32/kFloat64.

  It caused the test-gap-resolver/FuzzResolver failed at DCHECK_IMPLIES(kind == REGISTER && rep == MachineRepresentation::kFloat32,
  FloatRegister::from_code(index).IsAllocatable(RegisterConfiguration::TURBOFAN)), src/compiler/instruction.cc, line 259, under
  debug mode.

  This CL disable test-gap-resolver/FuzzResolver test case for x87.

BUG=

Review-Url: https://codereview.chromium.org/2120203002
Cr-Commit-Position: refs/heads/master@{#37515}

test/cctest/cctest.status

@@ -373,6 +373,7 @@
   'test-run-machops/RunFloat64Expm1': [SKIP],
   'test-run-machops/RunFloat64Tan': [SKIP],
   'test-cpu-profiler/Inlining': [SKIP],
+  'test-gap-resolver/FuzzResolver': [SKIP],
 }],  # 'arch == x87'
 
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