[PATCH, gas/ARM] Add support for Cortex-M23

[Thomas Preudhomme <thomas dot preudhomme at foss dot arm dot com>]

[resending with mailing list also as recipient this time]

Hi,

This patch adds support for the Cortex-M23 processors launched by ARM [1]. The 
patch adds support for the name and wires it up to the ARMv8-M Baseline 
architecture. It also updates documentation to mention this new processor.

[1] http://www.arm.com/products/processors/cortex-m/cortex-m23-processor.php

ChangeLog entry is as follows:

*** gas/Changelog ***

2016-10-26  Thomas Preud'homme  <thomas.preudhomme@arm.com>

         * config/tc-arm.c (cortex-m23): Declare new processor.
         * doc/c-arm.texi (cortex-m23): Document new processor.


Tested by building libgcc and libstdc++ for Cortex-M23 and running a hello world 
compiled for it.

Is this ok for master?

Best regards,

Thomas

diff --git a/gas/config/tc-arm.c b/gas/config/tc-arm.c
index 73f8396396ff85276dc5bc92f79764d6d194b3d3..69dfe989133cbdc12f2da9d2864e6788eace3353 100644
--- a/gas/config/tc-arm.c
+++ b/gas/config/tc-arm.c
@@ -25406,6 +25406,8 @@ static const struct arm_cpu_option_table arm_cpus[] =
   ARM_CPU_OPT ("cortex-r8",	ARM_ARCH_V7R_IDIV,
 						 FPU_ARCH_VFP_V3D16,
 								  "Cortex-R8"),
+  ARM_CPU_OPT ("cortex-m23",	ARM_ARCH_V8M_BASE,
+						 FPU_NONE,	  "Cortex-M23"),
   ARM_CPU_OPT ("cortex-m7",	ARM_ARCH_V7EM,	 FPU_NONE,	  "Cortex-M7"),
   ARM_CPU_OPT ("cortex-m4",	ARM_ARCH_V7EM,	 FPU_NONE,	  "Cortex-M4"),
   ARM_CPU_OPT ("cortex-m3",	ARM_ARCH_V7M,	 FPU_NONE,	  "Cortex-M3"),
diff --git a/gas/doc/c-arm.texi b/gas/doc/c-arm.texi
index 0cf7390dc5f28dc34b33c377ff59f06f5aee2a89..565ef73250e957e2da11cc261ec9d4b5ccb9c7c2 100644
--- a/gas/doc/c-arm.texi
+++ b/gas/doc/c-arm.texi
@@ -131,6 +131,7 @@ recognized:
 @code{cortex-r5},
 @code{cortex-r7},
 @code{cortex-r8},
+@code{cortex-m23},
 @code{cortex-m7},
 @code{cortex-m4},
 @code{cortex-m3},