[PATCH, libffi, alpha]: Use FFI_ASSERT in ffi_closure_osf_inner

[Uros Bizjak <ubizjak at gmail dot com>]

Hello!

Attached patch fixes libgo reflect test failure with libffi closures.
The gccgo compiler started to use FFI closures recently; the compiler
passes ffi_type_void for structures with zero members.

ffi_call form src/alpha/ffi.c allows FFI_TYPE_VOID arguments in
non-debug mode through the default: case, but ffi_closure_osf_inner
aborts with this type of argument.

The patch changes the default case in ffi_closure_osf_inner from abort
to FFI_ASSERT, an this way synchronizes argument handling in both
cases.

2014-07-21  Uros Bizjak  <ubizjak@gmail.com>

    * src/alpha/ffi.c: Do not include stdlib.h.
    (ffi_closure_osf_inner) <default>: Use FFI_ASSERT instead of abort.

Patch was tested with libffi testsuite on alphaev6-linux-gnu.
Additionally, the patch fixed reflect test from the libgo testsuite
and go.test/test/recover.go test from the gcc testsuite.

Uros.

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