[gcc r12-9661] riscv: update riscv_asan_shadow_offset

[gcc r12-9661] riscv: update riscv_asan_shadow_offset

[Andreas Schwab]

https://gcc.gnu.org/g:2910660f00c74d12d17e3114870e287804a3332c

commit r12-9661-g2910660f00c74d12d17e3114870e287804a3332c
Author: Andreas Schwab <schwab@suse.de>
Date:   Sun May 28 12:08:22 2023 +0200

    riscv: update riscv_asan_shadow_offset
    
    gcc/
            PR target/110036
            * config/riscv/riscv.cc (riscv_asan_shadow_offset): Update to
            match libsanitizer.

Diff:
---
 gcc/config/riscv/riscv.cc | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/gcc/config/riscv/riscv.cc b/gcc/config/riscv/riscv.cc
index 4939d9964db..dddd72aa237 100644
--- a/gcc/config/riscv/riscv.cc
+++ b/gcc/config/riscv/riscv.cc
@@ -5600,9 +5600,8 @@ riscv_asan_shadow_offset (void)
   /* We only have libsanitizer support for RV64 at present.
 
      This number must match kRiscv*_ShadowOffset* in the file
-     libsanitizer/asan/asan_mapping.h which is currently 1<<29 for rv64,
-     even though 1<<36 makes more sense.  */
-  return TARGET_64BIT ? (HOST_WIDE_INT_1 << 29) : 0;
+     libsanitizer/asan/asan_mapping.h.  */
+  return TARGET_64BIT ? HOST_WIDE_INT_UC (0xd55550000) : 0;
 }
 
 /* Initialize the GCC target structure.  */