[Bug default/25291] create_import_tree phase 2 slowness

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=25291

--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
The most pragmatic way to handle this is --devel-gen-cu --devel-uni-lang. Less
imports generated, less scope for create_import_tree.

Consider f.i. this log file for file debug/Checker.so.debug:
...
+ ../measure/time.sh ./dwz debug/Checker.so.debug -o debug/Checker.so.debug.0.z
-lnone -Lnone --no-odr
maxmem: 5913264
real: 70.78
user: 65.74
system: 5.01
+ ../measure/time.sh ./dwz debug/Checker.so.debug -o debug/Checker.so.debug.1.z
-lnone -Lnone --odr --odr-mode=link
maxmem: 6091880
real: 104.91
user: 100.47
system: 4.39
+ ../measure/time.sh ./dwz debug/Checker.so.debug -o debug/Checker.so.debug.2.z
-lnone -Lnone --odr --odr-mode=link --devel-uni-lang --devel-gen-cu
maxmem: 6069780
real: 83.50
user: 79.32
system: 4.17
+ ../measure/diff.sh debug/Checker.so.debug debug/Checker.so.debug.0.z
.debug_info      red: .01%      542547271  542518778
.debug_abbrev    red: .11%      5277543  5271927
.debug_str       red: 0%        63361040  63361040
total            red: .01%      611185854 611151745
+ ../measure/diff.sh debug/Checker.so.debug debug/Checker.so.debug.1.z
.debug_info      red: 32.82%    542547271  364493736
.debug_abbrev    red: -9.44%    5277543  5775931
.debug_str       red: 0%        63361040  63361040
total            red: 29.06%    611185854 433630707
+ ../measure/diff.sh debug/Checker.so.debug debug/Checker.so.debug.2.z
.debug_info      red: 33.00%    542547271  363553611
.debug_abbrev    red: -9.12%    5277543  5759093
.debug_str       red: 0%        63361040  63361040
total            red: 29.21%    611185854 432673744
...

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