[turbofan] Switch inlining tests to global scope.

test/cctest/cctest.status

Index: test/cctest/cctest.status
diff --git a/test/cctest/cctest.status b/test/cctest/cctest.status
index 5fa4f6314b094562e487960f1b3b888b17b8370b..8b8009806a20764e0e8c7aeb5ea4c3f41029afa5 100644
--- a/test/cctest/cctest.status
+++ b/test/cctest/cctest.status
@@ -405,9 +405,7 @@
 
 ##############################################################################
 ['ignition_turbofan', {
-  # TODO(rmcilroy,4837): Inlining is currently disabled for the BytecodeGraphBuilder
-  # (see InliningPhase::Run). Also, we don't set a LoadContextSlot for a function as
-  # immutable in the BytecodeGraphBuilder, therefore no inlining happens.
+  # TODO(5251): Inlining is currently disabled for the BytecodeGraphBuilder.
   'test-run-inlining/InlineLoopGuardedTwice': [FAIL],
   'test-run-inlining/InlineSurplusArgumentsDeopt': [FAIL],
   'test-run-inlining/InlineTwice': [FAIL],