final git bisect step leads to: "fatal: you want to use way too much memory"

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To reproduce the issue, just run:

markus@x4 ~ % git clone git://gcc.gnu.org/git/gcc.git
markus@x4 gcc % git checkout -b gcc-6 origin/gcc-6-branch 
markus@x4 gcc % git bisect bad 23240454adf1
You need to start by "git bisect start"
Do you want me to do it for you [Y/n]? y
markus@x4 gcc % git bisect good 558525d0cf3
Bisecting: 45 revisions left to test after this (roughly 6 steps)
[c4727bc59ecad9e8879aed135624781fabae16b5]      PR c++/71372    *
cp-gimplify.c (cp_fold): For INDIRECT_REF, if the folded expression   is
INDIRECT_REF or MEM_REF, copy over TREE_READONLY, TREE_SIDE_EFFECTS
and TREE_THIS_VOLATILE flags.  For ARRAY_REF and ARRAY_RANGE_REF, copy
over TREE_READONLY, TREE_SIDE_EFFECTS and TREE_THIS_VOLATILE flags
to the newly built tree.
markus@x4 gcc % git bisect bad
Bisecting: 22 revisions left to test after this (roughly 5 steps)
[6935372a7f032acccf7876e7f54ddf494e101e5e] 2016-05-31  Richard Biener
<rguenther@xxxxxxx>
markus@x4 gcc % git bisect bad
Bisecting: 10 revisions left to test after this (roughly 4 steps)
[909ed6a89604db5baa55b62ad253a9bcd5d89c03] backport "Remove assert in
get_def_bb_for_const"
markus@x4 gcc % git bisect bad
Bisecting: 5 revisions left to test after this (roughly 3 steps)
[f216419e5c4c41df70dbe00a6ea1faea46484dc8] gcc/
markus@x4 gcc % git bisect bad
Bisecting: 2 revisions left to test after this (roughly 1 step)
[745d4ecd59a3430f7c7b3bf33db1083d529a018b] libstdc++/70762 fix fallback
implementation of nonexistent_path
markus@x4 gcc % git bisect good 
Bisecting: 0 revisions left to test after this (roughly 1 step)
[a64301f7ac47b9d8f4f816c5e935cda4c92716b7] 2016-05-26  Jerry DeLisle
<jvdelisle@xxxxxxxxxxx>
markus@x4 gcc % git bisect good
f216419e5c4c41df70dbe00a6ea1faea46484dc8 is the first bad commit
commit f216419e5c4c41df70dbe00a6ea1faea46484dc8
fatal: you want to use way too much memory
markus@x4 gcc % 

-- 
Markus
git bisect start
# bad: [23240454adf160862453a3a850451a304867c29b] 	Backported from mainline 	2016-06-04  Jakub Jelinek  <jakub@xxxxxxxxxx>
git bisect bad 23240454adf160862453a3a850451a304867c29b
# good: [558525d0cf372a48ae12b1dc27201dd47ab7878c] Daily bump.
git bisect good 558525d0cf372a48ae12b1dc27201dd47ab7878c
# bad: [c4727bc59ecad9e8879aed135624781fabae16b5] 	PR c++/71372 	* cp-gimplify.c (cp_fold): For INDIRECT_REF, if the folded expression 	is INDIRECT_REF or MEM_REF, copy over TREE_READONLY, TREE_SIDE_EFFECTS 	and TREE_THIS_VOLATILE flags.  For ARRAY_REF and ARRAY_RANGE_REF, copy 	over TREE_READONLY, TREE_SIDE_EFFECTS and TREE_THIS_VOLATILE flags 	to the newly built tree.
git bisect bad c4727bc59ecad9e8879aed135624781fabae16b5
# bad: [6935372a7f032acccf7876e7f54ddf494e101e5e] 2016-05-31  Richard Biener  <rguenther@xxxxxxx>
git bisect bad 6935372a7f032acccf7876e7f54ddf494e101e5e
# bad: [909ed6a89604db5baa55b62ad253a9bcd5d89c03] backport "Remove assert in get_def_bb_for_const"
git bisect bad 909ed6a89604db5baa55b62ad253a9bcd5d89c03
# bad: [f216419e5c4c41df70dbe00a6ea1faea46484dc8] gcc/
git bisect bad f216419e5c4c41df70dbe00a6ea1faea46484dc8
# good: [745d4ecd59a3430f7c7b3bf33db1083d529a018b] libstdc++/70762 fix fallback implementation of nonexistent_path
git bisect good 745d4ecd59a3430f7c7b3bf33db1083d529a018b
# good: [a64301f7ac47b9d8f4f816c5e935cda4c92716b7] 2016-05-26  Jerry DeLisle  <jvdelisle@xxxxxxxxxxx>
git bisect good a64301f7ac47b9d8f4f816c5e935cda4c92716b7

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