[Bug classpath/71622] gcc 5.3.1 crashes when it tries to compile qtbase [dev]

[milla.pohjanheimo at qt dot io]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71622

--- Comment #3 from mipohjan <milla.pohjanheimo at qt dot io> ---
* gcc version 5.3.1 20160413 (Ubuntu 5.3.1-14ubuntu2)
* Ubuntu 16.04 LTS (Xenial)
* gcc from the Ubuntu repositories
* qt cloned from http://codereview.qt-project.org/qt/qt5 [dev] branch
* qt configured with:
./configure -openssl -R . -opensource -confirm-license -nomake tests -verbose
-prefix . -nomake examples -no-widgets -force-debug-info
* and build with:
 make module-qtbase

Note there's no crash if configured with:
./configure -openssl -R . -opensource -confirm-license -nomake tests -verbose
-prefix . -developer-build -qtnamespace TestNamespace -qtlibinfix TestInfix
-nomake examples