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Fix crash in tracing object allocations
ObjectSpace.trace_object_allocations_start could crash since it adds a TracePoint for when objects are freed. However, TracePoint could crash since it modifies st tables while inside the GC that is trying to free the object. This could cause a memory allocation to happen which would crash if it triggers another GC. See a crash log: http://ci.rvm.jp/results/trunk@ruby-sp1/4373707
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