Use LLD for partialLd.

Clang will soon start using relocations that are currently unsupported by
the version of ld.bfd that Android uses when HWASAN is enabled. This will
cause partialLd to fail since the clang driver defaults to ld.bfd.

Switch to using LLD, since it will support those relocations.

Change-Id: I0964f53dc63773f3b52bb377f863df9c39961a07

cc/builder.go

@@ -78,7 +78,7 @@ var (
 		blueprint.RuleParams{
 			// Without -no-pie, clang 7.0 adds -pie to link Android files,
 			// but -r and -pie cannot be used together.
-			Command:     "$ldCmd -nostdlib -no-pie -Wl,-r ${in} -o ${out} ${ldFlags}",
+			Command:     "$ldCmd -fuse-ld=lld -nostdlib -no-pie -Wl,-r ${in} -o ${out} ${ldFlags}",
 			CommandDeps: []string{"$ldCmd"},
 		},
 		"ldCmd", "ldFlags")