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DECL_RTL vs. explicit make_decl_rtl calls



Why do we ever perform explicit make_decl_rtl calls when
DECL_RTL will do that when necessary?

I noticed this over the last few days while trying to discover what
causes GC fragmentation and large amounts of dead RTL.  Just think of
all the DECL_RTL generated from the system header files while
compiling C, most of which will be never accessed again during the
compilation as far as I can tell.


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