AArch32: fix bootstrap failure

[Alex Coplan]

Hello,

The attached patch fixes a bootstrap failure on AArch32 introduced by
https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=308bc496884706af4b3077171cbac684c7a6f7c6

This makes the declaration of arm_add_stmt_cost match the definition, and removes the redundant
class keyword from the definition.

Testing:
  * Bootstrap on arm-linux-gnueabihf.

Thanks,
Alex

---

gcc/ChangeLog:

2020-05-07  Alex Coplan  <alex.coplan@arm.com>

        * config/arm/arm.c (arm_add_stmt_cost): Fix declaration, remove class from definition.
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