PATCH fix --enable-mapped-location build failures

[Mark Mitchell]

Per Bothner wrote:
> There as been some bit-rotting of --enable-mapped-location as people
> have made various changes in line-number-related code without
> testing with --enable-mapped-location.  The attached patches fix
> these, except in gcc/java, which I will submit separately.
> I've included a patch for cp/decl.c since it is the same change
> as in c-decl.c.
> 
> Ok for mainline?

The cp/decl.c change is OK.

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Mark Mitchell
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