[turbofan] Introduce CheckHole and CheckHoleNaN operators.

test/mjsunit/mjsunit.status

 # Copyright 2012 the V8 project authors. All rights reserved.
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 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
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@@ skipping 823 matching lines @@
 
   # TODO(rmcilroy,titzer): Times out after
   # https://codereview.chromium.org/1951013002 .
   'regress/regress-599717': [PASS, ['tsan', SKIP]],
 
   # TODO(rmcilroy,5038): Crashes in Deoptimizer::PatchCodeForDeoptimization on
   # nosnap builds when --stress-opt and --turbo-from-bytecode is enabled.
   'harmony/generators-turbo': [PASS, FAST_VARIANTS],
   'regress/regress-crbug-352058': [SKIP],
 
+  # TODO(jarin): No truncations on CheckFloat64Hole.
+  'getters-on-elements': [SKIP],
 }],  # ignition or ignition_turbofan
 
 ['(ignition or ignition_turbofan) and arch == arm64', {
   # TODO(rmcilroy,4680): Arm64 specific timeouts.
   'asm/construct-double': [SKIP],
   'compiler/osr-one': [SKIP],
   'compiler/osr-two': [SKIP],
   'wasm/asm-wasm-i32': [SKIP],
   'wasm/asm-wasm-u32': [SKIP],
 }],  # (ignition or ignition_turbofan) and arch == arm64
@@ skipping 21 matching lines @@
 ##############################################################################
 ['gcov_coverage', {
   # Tests taking too long.
   'array-functions-prototype-misc': [SKIP],
 
   # Stack overflow.
   'big-array-literal': [SKIP],
 }],  # 'gcov_coverage'
 
 ]