re PR d/90064 (InSituRegion lacks SPARC64 support)

	PR d/90064
libphobos: Merge upstream phobos 428460ddd

Defines growDownwards on SPARC64, initial patch by Rainer Orth.

Backports another fix to std.process, allowing permissions tests to be
skipped when running as root.

Reviewed-on: https://github.com/dlang/phobos/pull/6962

From-SVN: r270483

libphobos/src/MERGE

-cf95639ffd9ed6f3b9d10d98461b2fbd31615757
+428460ddd8087fa28815e613ff04facb51108a7b
 
 The first line of this file holds the git revision number of the last
 merge done from the dlang/phobos repository.

libphobos/src/std/experimental/allocator/building_blocks/region.d

@@ -395,6 +395,7 @@ struct InSituRegion(size_t size, size_t minAlign = platformAlignment)
     else version (RISCV32) enum growDownwards = Yes.growDownwards;
     else version (RISCV64) enum growDownwards = Yes.growDownwards;
     else version (SPARC) enum growDownwards = Yes.growDownwards;
+    else version (SPARC64) enum growDownwards = Yes.growDownwards;
     else version (SystemZ) enum growDownwards = Yes.growDownwards;
     else static assert(0, "Dunno how the stack grows on this architecture.");
 

libphobos/src/std/process.d

@@ -1188,6 +1188,8 @@ version (Posix) @system unittest
     // can't run in directory if user does not have search permission on this directory
     version (Posix)
     {
+        if (core.sys.posix.unistd.getuid() != 0)
+        {
             import core.sys.posix.sys.stat : S_IRUSR;
             auto directoryNoSearch = uniqueTempPath();
             mkdir(directoryNoSearch);
@@ -1196,6 +1198,7 @@ version (Posix) @system unittest
             assertThrown!ProcessException(spawnProcess(prog.path, null, Config.none, directoryNoSearch));
             assertThrown!ProcessException(spawnProcess(prog.path, null, Config.detached, directoryNoSearch));
         }
+    }
 }
 
 @system unittest // Specifying empty working directory.