Auto merge of #3444 - SteveLauC:map_huge_shift, r=JohnTitor

MAP_HUGE_SHIFT & HUGETLB_FLAG_ENCODE_SHIFT for Andorid/Fuchsia

Add these 2 constants for Android and Fuchsia

Author: bors

libc-test/semver/android.txt

@@ -3766,3 +3766,5 @@ dirname
 basename
 eventfd_read
 eventfd_write
+HUGETLB_FLAG_ENCODE_SHIFT
+MAP_HUGE_SHIFT

libc-test/semver/fuchsia.txt

@@ -1472,3 +1472,5 @@ utimensat
 vhangup
 vmsplice
 waitid
+HUGETLB_FLAG_ENCODE_SHIFT
+MAP_HUGE_SHIFT

src/fuchsia/mod.rs

@@ -3233,6 +3233,9 @@ pub const O_DIRECT: ::c_int = 0x00000800;
 pub const O_LARGEFILE: ::c_int = 0x00001000;
 pub const O_NOFOLLOW: ::c_int = 0x00000080;
 
+pub const HUGETLB_FLAG_ENCODE_SHIFT: u32 = 26;
+pub const MAP_HUGE_SHIFT: u32 = 26;
+
 // intentionally not public, only used for fd_set
 cfg_if! {
     if #[cfg(target_pointer_width = "32")] {

src/unix/linux_like/android/mod.rs

@@ -3320,6 +3320,8 @@ pub const NET_SCTP: ::c_int = 17;
 pub const NET_LLC: ::c_int = 18;
 pub const NET_NETFILTER: ::c_int = 19;
 pub const NET_DCCP: ::c_int = 20;
+pub const HUGETLB_FLAG_ENCODE_SHIFT: ::c_int = 26;
+pub const MAP_HUGE_SHIFT: ::c_int = HUGETLB_FLAG_ENCODE_SHIFT;
 
 // Most `*_SUPER_MAGIC` constants are defined at the `linux_like` level; the
 // following are only available on newer Linux versions than the versions