[PATCH GCC]Fix test case failure reported in PR54989

[Bin Cheng]

Hi,
The test case "gcc/testsuite/gcc.dg/hoist-register-pressure.c" is failed on
x86_64-apple-darwin because it uses more registers than x86_64-linux. This
can be fixed by simplifying the case using fewer registers. 

Tested on x86_64-apple-darwin/x86_64-linux, is it OK?

Thanks


gcc/testsuite/ChangeLog
2012-10-22  Bin Cheng  <bin.cheng@arm.com>

	* gcc.dg/hoist-register-pressure.c: Simplify the case
	by using fewer registers.


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