<bionic/macros.h>: replace align_up()/align_down() with clang's builtins.
Change-Id: If39cf028e9a22fc2008ee9d1ba683a4d0d038325
diff --git a/libc/private/CFIShadow.h b/libc/private/CFIShadow.h
index cbdf0f7..b40c063 100644
--- a/libc/private/CFIShadow.h
+++ b/libc/private/CFIShadow.h
@@ -40,7 +40,7 @@
// below) are interpreted as follows.
//
// For an address P and corresponding shadow value V, the address of __cfi_check is calculated as
-// align_up(P, 2**kShadowGranularity) - (V - 2) * (2 ** kCfiCheckGranularity)
+// __builtin_align_up(P, 2**kShadowGranularity) - (V - 2) * (2 ** kCfiCheckGranularity)
//
// Special shadow values:
// 0 = kInvalidShadow, this memory range has no valid CFI targets.