[ARM] Add support for ARM Cortex-R52 processor

=== Context ===

This patch is part of a patch series to add support for ARMv8-R
architecture. Its purpose is to add support for ARM Cortex-R52
processor.

=== Patch description ===

This patch adds support for Cortex-R52 as an ARMv8-R processor with CRC
extensions.

2017-06-26  Thomas Preud'homme  <thomas.preudhomme@arm.com>

gas/
	* NEWS: Mention support of ARM Cortex-R52 processor.
	* config/tc-arm.c (arm_cpus): Add entry for ARM Cortex-R52 processor.
	* doc/c-arm.texi: Mention support for -mcpu=cortex-r52.

gas/ChangeLog

@@ -1,3 +1,9 @@
+2017-06-26  Thomas Preud'homme  <thomas.preudhomme@arm.com>
+
+	* NEWS: Mention support of ARM Cortex-R52 processor.
+	* config/tc-arm.c (arm_cpus): Add entry for ARM Cortex-R52 processor.
+	* doc/c-arm.texi: Mention support for -mcpu=cortex-r52.
+
 2017-06-24  Thomas Preud'homme  <thomas.preudhomme@arm.com>
 
 	* NEWS: Mention support for ARMv8-R architecture.

gas/NEWS

@@ -10,7 +10,8 @@
 
 * Add support for the Texas Instruments PRU processor.
 
-* Support for the ARMv8-R architecture has been added to the ARM port.
+* Support for the ARMv8-R architecture and Cortex-R52 processor has been
+  added to the ARM port.
 
 Changes in 2.28:
 

gas/config/tc-arm.c

@@ -25780,6 +25780,9 @@ static const struct arm_cpu_option_table arm_cpus[] =
   ARM_CPU_OPT ("cortex-r8",	  "Cortex-R8",	       ARM_ARCH_V7R,
 	       ARM_FEATURE_CORE_LOW (ARM_EXT_ADIV),
 	       FPU_ARCH_VFP_V3D16),
+  ARM_CPU_OPT ("cortex-r52",	  "Cortex-R52",	       ARM_ARCH_V8R,
+	      ARM_FEATURE_COPROC (CRC_EXT_ARMV8),
+	      FPU_ARCH_NEON_VFP_ARMV8),
   ARM_CPU_OPT ("cortex-m33",	  "Cortex-M33",	       ARM_ARCH_V8M_MAIN,
 	       ARM_FEATURE_CORE_LOW (ARM_EXT_V5ExP | ARM_EXT_V6_DSP),
 	       FPU_NONE),

gas/doc/c-arm.texi

@@ -131,6 +131,7 @@ recognized:
 @code{cortex-r5},
 @code{cortex-r7},
 @code{cortex-r8},
+@code{cortex-r52},
 @code{cortex-m33},
 @code{cortex-m23},
 @code{cortex-m7},