[PATCH][Arm] Fix multilibs for Armv7-R

[Andre Vieira (lists)]

Hi

This patch maps multilibs using -march=armv7-r+vfpv3-d16-fp16 and
-march=armv7-r+vfpv3-d16-fp16+idiv to v7+fp.  This patch also adds a new
multilib for armv7-r+fp.sp and maps -march=armv7-r+fp.sp+idiv,
-march=armv7-r+vfpv3xd-fp16 and -march=armv7-r+vfpv3xd-fp16+idiv to it.

This solves issues encountered when trying to link for
-mcpu=cortex-r8 -mfloat-abi=hard.

Built arm-none-eabi and compared testsuite run of 
-march=armv7e-m+fp/-mfloat-abi=hard to 
-march=armv7-r+fp.sp/-mfloat-abi=hard which looked alright.

Is this OK for trunk?

gcc/ChangeLog:
2019-10-18  Andre Vieira  <andre.simoesdiasvieira@arm.com>

         * config/arm/t-multilib: Add new multilib variants and new
         mappings.

gcc/testsuite/ChangeLog:
2019-10-18  Andre Vieira  <andre.simoesdiasvieira@arm.com>

         * gcc.target/arm/multilib.exp: Add extra tests.


Cheers,
Andre
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