Reapply "ANDROID: arm64: lse: fix LSE atomics with LTO"

This reverts commit 8e482856b5.

Change-Id: Ib355d368a3b322a08f649889ab6186f9642615da

arch/arm64/include/asm/lse.h

@@ -22,6 +22,13 @@
 
 #else	/* __ASSEMBLER__ */
 
+#ifdef CONFIG_LTO_CLANG
+#define __LSE_PREAMBLE	".arch_extension lse\n"
+#else
+__asm__(".arch_extension	lse");
+#define __LSE_PREAMBLE
+#endif
+
 /* Move the ll/sc atomics out-of-line */
 #define __LL_SC_INLINE		notrace
 #define __LL_SC_PREFIX(x)	__ll_sc_##x