[PATCH, testsuite]: Cleanup dg-options in gcc.target/i386/ a bit

[Uros Bizjak <ubizjak at gmail dot com>]

2017-08-29  Uros Bizjak  <ubizjak@gmail.com>

    * gcc.target/i386/20030926-1.c: Add dg-additional-options.
    * gcc.target/i386/abi-2.c: Ditto.
    * gcc.target/i386/interrupt-sibcall-2.c: Ditto.
    * gcc.target/i386/pr22076.c: Ditto.
    * gcc.target/i386/pr37216.c: Ditto.
    * gcc.target/i386/pr39431.c: Ditto.
    * gcc.target/i386/pr40906-1.c: Ditto.
    * gcc.target/i386/pr40906-2.c: Ditto.
    * gcc.target/i386/pr43766.c: Ditto.
    * gcc.target/i386/pr46226.c: Ditto.
    * gcc.target/i386/pr46470.c: Ditto.
    * gcc.target/i386/pr59929.c: Ditto.
    * gcc.target/i386/sse-10.c: Ditto.
    * gcc.target/i386/vararg-1.c: Ditto.
    * gcc.target/i386/vararg-1.c: Ditto.
    * gcc.target/i386/asm-6.c: Compile for fpic target only.
    * gcc.target/i386/pr44223.c: Ditto.
    * gcc.target/i386/bitfield1.c (dg-options): Remove target selector.
    * gcc.target/i386/bitfield2.c (dg-options): Ditto.
    * gcc.target/i386/pr67480.c (dg-options): Ditto.
    * gcc.target/i386/vect-cond-1.c (dg-options): Ditto.
    * gcc.target/i386/bittest.c (scan-assembler-times): Ditto.
    * gcc.target/i386/darwin-fpmath.c (dg-do): Simplify target selector.
    * gcc.target/i386/mvc9.c: Compile for lto target only.
    * gcc.target/i386/pr45234.c: Compile for ia32 target only.
    * gcc.target/i386/pr49866.c: Compile for lp64 target only.
    * gcc.target/i386/pr57091.c: Ditto.
    * gcc.target/i386/pr61599-2.c: Ditto.

Tested on x86_64-linux-gnu {,-m32}.

Committed to mainline.

Uros.

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