linux-yocto/4.14/4.15: gcc8 fixes

linux-yocto/4.14/4.15: gcc8 fixes

Integrating Khem's gcc8 kernel patches so that 4.14 and 4.15 can build
with the gcc8 compiler updates.

  51273ff79f4a tools/lib/subcmd/pager.c: do not alias select() params
  b632c05a6263 objtool, perf: Fix GCC 8 -Wrestrict error
  20bc5eb24ac1 mips64: Disable attribute-alias warning
  975042cc72dd mips: Disable attribute-alias warnings
  8632f470f02c powerpc/ptrace: Disable array-bounds warning with gcc8
  59e401ffeda4 powerpc: Disable attribute-alias warnings from gcc8

(From OE-Core rev: eed723d09992c9b89fcb2760f8c95f69c201aa3c)

Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Armin Kuster <akuster808@gmail.com>