[patch 2/5] hoist -fstrict-volatile-bitfields test

[Sandra Loosemore]

This patch makes parallel changes to store_bit_field_1 and 
extract_bit_field_1 to skip some register shortcuts if 
-fstrict-volatile-bitfields applies.  By itself, it doesn't fix any of 
the new test cases added in part 5, but it's required in conjunction 
with part 3 to make the new volatile-bitfields-3.c test pass on some 
targets (specifically, x86_64).

This part of the patch series has already been approved, but since it's 
probably not useful without the other pieces, I'm deferring checking it 
in for now.

-Sandra

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