Re-enable gold linker for aarch64.

Turn back on ld.gold and W-l,--icf=safe for
aarch64, now that the prebuilt ld.gold has been updated
with support for reloc 311/312 (fixed upstream, see
https://sourceware.org/bugzilla/show_bug.cgi?id=19042)

Bug: 25642296
Bug: 26153840

Change-Id: Idceb357a48d9da4eec38ab8f2103245d500622ae
diff --git a/core/combo/TARGET_linux-arm64.mk b/core/combo/TARGET_linux-arm64.mk
index fbf8ab0..bc89bc9 100644
--- a/core/combo/TARGET_linux-arm64.mk
+++ b/core/combo/TARGET_linux-arm64.mk
@@ -115,6 +115,8 @@
 			-Wl,-maarch64linux \
 			-Wl,--hash-style=gnu \
 			-Wl,--fix-cortex-a53-843419 \
+			-fuse-ld=gold \
+			-Wl,--icf=safe \
 			-Wl,--no-undefined-version \
 			$(arch_variant_ldflags)