re: port-i386/56280: Many asan tests are failing on i386

[matthew green <mrg%eterna.com.au@localhost>]

surprisingly simple to "fix" below.  probably, this needs
to be made configureable by the platform code, rather than
assuming 0x2000000 is right (we use 0x40000000 mostly for
32 bit ports), or perhaps adjusting the asan code to use
0x20000000 for netbsd/i386.


.mrg.


Index: gcc/config/i386/i386.c
===================================================================
RCS file: /cvsroot/src/external/gpl3/gcc/dist/gcc/config/i386/i386.c,v
retrieving revision 1.24
diff -p -u -r1.24 i386.c
--- gcc/config/i386/i386.c	11 Apr 2021 00:02:13 -0000	1.24
+++ gcc/config/i386/i386.c	28 Jun 2021 08:41:44 -0000
@@ -1399,7 +1399,7 @@ ix86_asan_shadow_offset (void)
 {
   return TARGET_LP64 ? (TARGET_MACHO ? (HOST_WIDE_INT_1 << 44)
 				     : HOST_WIDE_INT_C (0x7fff8000))
-		     : (HOST_WIDE_INT_1 << 29);
+		     : (HOST_WIDE_INT_1 << 30);
 }
 
 /* Argument support functions.  */