Changes from original patch:

1. Merged test_redef_* test files into one
2. Encapsulated contents of arm-mve-builtins.h in namespace arm_mve (missed
   in initial patch).
3. Added extern declarations for scalar_types and acle_vector types to
   arm-mve-builtins.h (missed in initial patch).
4. Added arm-mve-builtins.(cc|h) to gt_targets for arm-*-*-* (missed in
   initial patch).
5. Added include for gt-arm-mve-builtins.h to arm-mve-builtins.cc (missed in
   initial patch).
6. Removed explicit initialisation of handle_arm_mve_types_p as it is unneeded.

---

This patch moves the implementation of MVE ACLE types from
arm_mve_types.h to inside GCC via a new pragma, which replaces the prior
type definitions. This allows for the types to be used internally for
intrinsic function definitions.

Bootstrapped and regression tested on arm-none-linux-gnuabihf, and
regression tested on arm-eabi -- no issues.

Thanks,
Murray

gcc/ChangeLog:

        * config.gcc: Add arm-mve-builtins.o to extra_objs for arm-*-*-*
        targets.
        * config/arm/arm-c.c (arm_pragma_arm): Handle new pragma.
        (arm_register_target_pragmas): Register new pragma.
        * config/arm/arm-protos.h: Add arm_mve namespace and declare
        arm_handle_mve_types_h.
        * config/arm/arm_mve_types.h: Replace MVE type definitions with
        new pragma.
        * config/arm/t-arm: Add arm-mve-builtins.o target.
        * config/arm/arm-mve-builtins.cc: New file.
        * config/arm/arm-mve-builtins.def: New file.
        * config/arm/arm-mve-builtins.h: New file.

gcc/testsuite/ChangeLog:

        * gcc.target/arm/mve/mve.exp: Add new subdirectories.
        * gcc.target/arm/mve/general-c/type_redef_1.c: New test.
        * gcc.target/arm/mve/general/double_pragmas_1.c: New test.
        * gcc.target/arm/mve/general/nomve_1.c: New test.