For libm, use a macro for aliasing symbols.

Change-Id: Ibd42ebc387c2bf3eba9aa96091770915b4b34184
diff --git a/libm/arm64/lrint.S b/libm/arm64/lrint.S
index 69cc10c..d642759 100644
--- a/libm/arm64/lrint.S
+++ b/libm/arm64/lrint.S
@@ -29,8 +29,6 @@
 END(lrintf)
 
 // sizeof(long) and sizeof(long long) are the same for aarch64
-.weak llrint
-.equ llrint,lrint
+ALIAS_SYMBOL(llrint, lrint);
 
-.weak llrintf
-.equ llrintf,lrintf
+ALIAS_SYMBOL(llrintf, lrintf);