[arm-embedded] Backport mainline r174549 r178906

[Joey Ye]

Backport mainline r178906, r174549 to ARM/embedded-4_6-branch.

Committed.

2011-09-20  Terry Guo  <terry.guo@arm.com>

        Backport r178906 from mainline
        2011-09-16  Terry Guo  <terry.guo@arm.com>

        * gcc.dg/tree-ssa/foldconst-3.c: Don't use short enums.

2011-09-20  Terry Guo  <terry.guo@arm.com>

        Backport r174549 from mainline
        2011-06-01  Sofiane Naci  <sofiane.naci@arm.com>

        * gcc.target/arm/scd42-2.c: Likewise.