[PATCH arm/embedded-4_7-branch]fix fialure of mtune option

[Bin Cheng]

Hi,
This patch fixes failure of command "arm-none-eabi-gcc -O2 -mthumb
-mtune=cortex-m4 ..." on arm/embedded-4_7-branch by removing the assertion
in arm_cortex_v7m_branch_cost.

Is it OK?

Thanks.

2013-06-06  Bin Cheng  <bin.ch...@arm.com>

        * config/arm/arm.c (arm_cortex_v7m_branch_cost): Remove assertion
        on TARGET_32BIT and TARGET_THUMB2.
Index: gcc/config/arm/arm.c
===================================================================
--- gcc/config/arm/arm.c        (revision 199680)
+++ gcc/config/arm/arm.c        (working copy)
@@ -8760,8 +8760,6 @@ arm_cortex_a5_branch_cost (bool speed_p, bool pred
 static int
 arm_cortex_v7m_branch_cost (bool speed_p, bool predictable_p ATTRIBUTE_UNUSED)
 {
-  gcc_assert (TARGET_32BIT && TARGET_THUMB2);
-
   return 1;
 }