[PATCH AutoFDO/1]Avoid infinite recursion for inlined function decl tracing

[bin.cheng]

Hi,
This simple patch avoids infinite recursion when tracing inlined function decl by using
pre-defined macro DECL_FROM_INLINE in tree.h.

Bootstrap and test on x86_64 in patch set.  Is it OK?

Thanks,
bin

2018-10-31  Bin Cheng  <bin.cheng@linux.alibaba.com>

	* auto-profile.c (string_table::get_index_by_decl)
	(function_instance::get_function_instance_by_decl): Avoid infinite
	recursion by using DECL_FROM_INLINE.
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