Validated, with updated toolchain from xenial-proposed:

# dpkg-query -W gcc-5
gcc-5   5.3.1-14ubuntu2.1

The code generation problem is resolved, as per testcase in gcc test-
suite / bug report description

--- old.txt     2016-05-17 07:15:13.050518853 +0100
+++ new.txt     2016-05-17 07:15:28.370750313 +0100
@@ -2,10 +2,10 @@
    4:  b3 c1 00 0f             ldgr    %f0,%r15
    8:  e3 f0 ff 58 ff 71       lay     %r15,-168(%r15)
    e:  b9 04 00 bf             lgr     %r11,%r15
-  12:  b3 cd 00 f0             lgdr    %r15,%f0
-  16:  e5 4c b0 a4 00 05       mvhi    164(%r11),5
-  1c:  58 10 b0 a4             l       %r1,164(%r11)
-  20:  b3 cd 00 b2             lgdr    %r11,%f2
+  12:  e5 4c b0 a4 00 05       mvhi    164(%r11),5
+  18:  58 10 b0 a4             l       %r1,164(%r11)
+  1c:  b3 cd 00 b2             lgdr    %r11,%f2
+  20:  b3 cd 00 f0             lgdr    %r15,%f0
   24:  07 fe                   br      %r14
   26:  07 07                   nopr    %r7


** Tags removed: verification-needed
** Tags added: verification-done

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https://bugs.launchpad.net/bugs/1572613

Title:
  GCC stack access scheduled after stack deallocation

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