Fix for SIGILL FTBFS in fc19/rawhide

[Chris Phillips]

Hi

The attached patch fixes the failure to build for fedora 19 / rawhide.
(Failure in the register allocation logic, diagnosed by APH to be issue
with PUSH/POP macro's and assumption of order of evaluation of arguments.)
The fix includes detection of the condition and bailing from the compilation
if a similar failure is detected.  Future fixes will address other 
JASSERT conditions
and provide less hidden failure modes.

This patch is against icedtea7 2.1 hotspot forest. After application it
builds on the 4GB machine that was seeing the problem consistently before.

Chris
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