Fix PR middle-end/54617

[Eric Botcazou]

In the recent patch for PR rtl-opt/44194 I left a case potentially ICEing 
because I managed to have it covered neither on x86-64 nor on SPARC 64-bit.
This PR brings the missing coverage and it's from the gcc.c-torture/compile 
testsuite on PowerPC/Darwin 64-bit.

Bootstrapped/regtested on x86-64/Linux, generated code manually inspected on 
PowerPC/Darwin 64-bit, applied on the mainline.


2012-09-18  Eric Botcazou  <ebotcazou@adacore.com>

	PR middle-end/54617
	* expr.c (store_field): Handle a PARALLEL in more cases.


-- 
Eric Botcazou
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