aarch64: Disable sysreg feature gating

This applies to the sysreg read/write intrinsics __arm_[wr]sr*.  It does
not depend on changes to Binutils, because GCC converts recognised
sysreg names to an encoding based form, which is already ungated in Binutils.

We have, however, agreed to make an equivalent change in Binutils (which
would then disable feature gating for sysreg accesses in inline
assembly), but this has not yet been posted upstream.

In the future we may introduce a new flag to renable some checking,
but these checks could not be comprehensive because many system
registers depend on architecture features that don't have corresponding
GCC/GAS --march options.  This would also depend on addressing numerous
inconsistencies in the existing list of sysreg feature dependencies.

gcc/ChangeLog:

	* config/aarch64/aarch64.cc
	(aarch64_valid_sysreg_name_p): Remove feature check.
	(aarch64_retrieve_sysreg): Ditto.

gcc/testsuite/ChangeLog:

	* gcc.target/aarch64/acle/rwsr-ungated.c: New test.

gcc/config/aarch64/aarch64.cc

@@ -31073,8 +31073,6 @@ aarch64_valid_sysreg_name_p (const char *regname)
   const sysreg_t *sysreg = aarch64_lookup_sysreg_map (regname);
   if (sysreg == NULL)
     return aarch64_is_implem_def_reg (regname);
-  if (sysreg->arch_reqs)
-    return bool (aarch64_isa_flags & sysreg->arch_reqs);
   return true;
 }
 
@@ -31098,8 +31096,6 @@ aarch64_retrieve_sysreg (const char *regname, bool write_p, bool is128op)
   if ((write_p && (sysreg->properties & F_REG_READ))
       || (!write_p && (sysreg->properties & F_REG_WRITE)))
     return NULL;
-  if ((~aarch64_isa_flags & sysreg->arch_reqs) != 0)
-    return NULL;
   return sysreg->encoding;
 }
 

gcc/testsuite/gcc.target/aarch64/acle/rwsr-ungated.c

@@ -0,0 +1,13 @@
+/* Test that __arm_[r,w]sr intrinsics aren't gated (by default).  */
+
+/* { dg-do compile } */
+/* { dg-options "-march=armv8-a" } */
+
+#include <arm_acle.h>
+
+uint64_t
+foo (uint64_t a)
+{
+  __arm_wsr64 ("zcr_el1", a);
+  return __arm_rsr64 ("smcr_el1");
+}