Ruby » Ruby master

merge revision(s) 44474,44538,44539,44890,44896: [Backport #9495]

    * configure.in: use SSE2 instructions for drop unexpected
      precisions.  [ruby-core:54738] [Bug #8358]

    * configure.in: use SSE2 instructions to drop unexpected precisions on
      other than mingw.  [ruby-core:59472] [Bug #8358]

    * configure.in: -mstackrealign is necessary for -msse2 working.
      [ruby-core:54716] [Bug #8349]

    * configure.in: -mstackrealign is necessary for -msse2 working.
      [ruby-core:54716] [Bug #8349]

    * configure.in: add qouting brackets and append wildcard for the
      rest after target_cpu, to properly detect platform for SSE2
      instructions.  [ruby-core:60576] [Bug #8358]

    * configure.in: Fix compilation error.
      https://bugs.ruby-lang.org/issues/8358#note-16

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@44993 b2dd03c8-39d4-4d8f-98ff-823fe69b080e