[Patch ARM] Document the +crypto extension on CPUs.

We don't document the list of CPU names which can take a +crypto extension
in the ARM port. This patch fixes that oversight.

gcc/

2017-14-07  James Greenhalgh  <james.greenhalgh@arm.com>

	* doc/invoke.texi (arm/-mcpu): Document +crypto.

From-SVN: r250207

gcc/ChangeLog

+2017-07-14  James Greenhalgh  <james.greenhalgh@arm.com>
+
+	* doc/invoke.texi (arm/-mcpu): Document +crypto.
+
 2017-07-14  Thomas Preud'homme  <thomas.preudhomme@arm.com>
 
 	* config/arm/arm-c.c (arm_cpu_builtins): Define

gcc/doc/invoke.texi

@@ -15636,6 +15636,14 @@ on @samp{cortex-r5}, @samp{cortex-r52} and @samp{cortex-m7}.
 Disables the SIMD (but not floating-point) instructions on
 @samp{generic-armv7-a}, @samp{cortex-a5}, @samp{cortex-a7}
 and @samp{cortex-a9}.
+
+@item +crypto
+Enables the cryptographic instructions on @samp{cortex-a32},
+@samp{cortex-a35}, @samp{cortex-a53}, @samp{cortex-a55}, @samp{cortex-a57},
+@samp{cortex-a72}, @samp{cortex-a73}, @samp{cortex-a75}, @samp{exynos-m1},
+@samp{xgene1}, @samp{cortex-a57.cortex-a53}, @samp{cortex-a72.cortex-a53},
+@samp{cortex-a73.cortex-a35}, @samp{cortex-a73.cortex-a53} and
+@samp{cortex-a75.cortex-a55}.
 @end table
 
 Additionally the @samp{generic-armv7-a} pseudo target defaults to