[PATCH] Implement P0966 std::string::reserve should not shrink

[Rainer Orth]

Hi Jonathan,

>>Here's the combined patch, based on your original with my proposed
>>simplifications applied.
>
> I've now pushed that combined patch to master.
>
> Sorry it took so long to integrate your changes, but thanks very much
> for the contribution to GCC!

it seems this patch caused

+FAIL: libstdc++-abi/abi_check

for 32-bit targets/multilibs.  I'm seeing it on both i386-pc-solaris2.11
and x86_64-pc-linux-gnu (32-bit only).

# of added symbols:              10
# of missing symbols:            8
# of undesignated symbols:       0
# of incompatible symbols:       8

	Rainer

-- 
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Rainer Orth, Center for Biotechnology, Bielefeld University