Add posix_fadvise(3).

(cherry-pick of 00008263782e484020420c606f7d145fe7d0a4d8.)

Bug: 12449798
Change-Id: I07cbf3f670a0d1304b68148325a774f266b5c433
Merge "Add posix_fadvise(3)."
Fix mips __fadvise64.S build failure.

Bug: 12449798
Change-Id: I0663b741108ba2f1d286904d6414b3ff4d475551
Merge "Fix mips __fadvise64.S build failure."
Add pthread_gettid_np and re-expose __get_thread for LP32.

A lot of third-party code calls the private __get_thread symbol,
often as part of a backport of bionic's pthread_rwlock implementation.
Hopefully this will go away for LP64 (since you're guaranteed the
real implementation there), but there are still APIs that take a tid
and no way to convert between a pthread_t and a tid. pthread_gettid_np
is a public API for that. To aid the transition, make __get_thread
available again for LP32.

(cherry-pick of 27efc48814b8153c55cbcd0af5d9add824816e69.)

Bug: 14079438
Change-Id: I43fabc7f1918250d31d4665ffa4ca352d0dbeac1
Merge "Add pthread_gettid_np and re-expose __get_thread for LP32."
Add IFUNC support for arm64 and IRELATIVE reloc

 There are number of changes in the way IFUNC related relocations are done:
 1. IRELATIVE relocations are now supported for x86/x86_64 and arm64.
 2. IFUNC relocations are now relying on static linker to generate
    them in correct order - this removes necessety of additional
    relocation pass for ifuncs.
 3. Related to 2: rela?.dyn relocations are preformed before .plt ones.
 4. Ifunc are resolved on symbol lookup this approach allowed to avoid
    mprotect(PROT_WRITE) call on r-x program segments.

Bug: 17399706
Bug: 17177284
Change-Id: I414dd3e82bd47cc03442c5dfc7c279949aec51ed
Merge "Add IFUNC support for arm64 and IRELATIVE reloc"
Expose __swsetup for LP32 binary compatibility.

(cherry-pick of 7e00b44e80d6e38b8ab86d0ebc86b666c0ac2ef6.)

Bug: 17476127
Change-Id: I0ef1355ac913d782c268a638f88642d6cfc236c2
Merge "Expose __swsetup for LP32 binary compatibility."