libgo patch committed: push arena on AIX higher due to clashes

[Ian Lance Taylor]

This libgo patch by Tony Reix changes the arena position on AIX higher
to avoid clashes.  Bootstrapped and ran Go testsuite on
x86_64-pc-linux-gnu.  Committed to mainline.

Ian

Index: gcc/go/gofrontend/MERGE
===================================================================
--- gcc/go/gofrontend/MERGE     (revision 258336)
+++ gcc/go/gofrontend/MERGE     (working copy)
@@ -1,4 +1,4 @@
-2a07cd31927ac943104f55d2b696e53e7cd073b3
+112623c89ee42b42bc748f12d9c704615634501b
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.
Index: libgo/go/runtime/malloc.go
===================================================================
--- libgo/go/runtime/malloc.go  (revision 258052)
+++ libgo/go/runtime/malloc.go  (working copy)
@@ -308,9 +308,9 @@ func mallocinit() {
                                p = uintptr(i)<<40 | uintptrMask&(0x0040<<32)
                        case GOOS == "aix":
                                if i == 0 {
-                                       p = uintptrMask&(1<<32) | 
uintptrMask&(0xa0<<52)
+                                       p = uintptrMask&(1<<42) | 
uintptrMask&(0xa0<<52)
                                } else {
-                                       p = uintptr(i)<<32 | 
uintptrMask&(0x70<<52)
+                                       p = uintptr(i)<<42 | 
uintptrMask&(0x70<<52)
                                }
                        default:
                                p = uintptr(i)<<40 | uintptrMask&(0x00c0<<32)