[gcc r12-2234] runtime: remove direct assignments to memory locations

[gcc r12-2234] runtime: remove direct assignments to memory locations

[Ian Lance Taylor]

https://gcc.gnu.org/g:1798cac7a8b3331a277da1f106752ce0a34f8937

commit r12-2234-g1798cac7a8b3331a277da1f106752ce0a34f8937
Author: Ian Lance Taylor <iant@golang.org>
Date:   Thu Jul 8 19:25:55 2021 -0700

    runtime: remove direct assignments to memory locations
    
    PR bootstrap/101374
    They cause a warning with the updated GCC -Warray-bounds option.
    Replace them with calls to abort, which for our purposes is fine.
    
    Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/333409

Diff:
---
 gcc/go/gofrontend/MERGE   | 2 +-
 libgo/runtime/proc.c      | 4 ++--
 libgo/runtime/runtime_c.c | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/gcc/go/gofrontend/MERGE b/gcc/go/gofrontend/MERGE
index ab1384d698b..4d0f44f2dd2 100644
--- a/gcc/go/gofrontend/MERGE
+++ b/gcc/go/gofrontend/MERGE
@@ -1,4 +1,4 @@
-01cb2b5e69a2d08ef3cc1ea023c22ed9b79f5114
+adcf10890833026437a94da54934ce50c0018309
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.
diff --git a/libgo/runtime/proc.c b/libgo/runtime/proc.c
index 38bf7a6b255..3a30748d329 100644
--- a/libgo/runtime/proc.c
+++ b/libgo/runtime/proc.c
@@ -594,7 +594,7 @@ runtime_mstart(void *arg)
 		gp->entry = nil;
 		gp->param = nil;
 		__builtin_call_with_static_chain(pfn(gp1), fv);
-		*(int*)0x21 = 0x21;
+		abort();
 	}
 
 	if(mp->exiting) {
@@ -662,7 +662,7 @@ setGContext(void)
 		gp->entry = nil;
 		gp->param = nil;
 		__builtin_call_with_static_chain(pfn(gp1), fv);
-		*(int*)0x22 = 0x22;
+		abort();
 	}
 }
 
diff --git a/libgo/runtime/runtime_c.c b/libgo/runtime/runtime_c.c
index 18222c14465..bc920a5d406 100644
--- a/libgo/runtime/runtime_c.c
+++ b/libgo/runtime/runtime_c.c
@@ -116,7 +116,7 @@ runtime_signalstack(byte *p, uintptr n)
 	if(p == nil)
 		st.ss_flags = SS_DISABLE;
 	if(sigaltstack(&st, nil) < 0)
-		*(int *)0xf1 = 0xf1;
+		abort();
 }
 
 int32 go_open(char *, int32, int32)