[patch][i386] Remove some dead code (TARGET_BRANCH_PREDICTION_HINTS)

[Steven Bosscher]

Hello,

TARGET_BRANCH_PREDICTION_HINTS isn't used at all. This patch removes it.
Bootstrapped&tested (incl. -m32) on x86_64-unknown-linux-gnu. OK for trunk?

Ciao!
Steven

        * final.c (final_forward_branch_p): Remove.
        * output.h (final_forward_branch_p): Remove prototype.
        * config/i386/i386.h (X86_TUNE_BRANCH_PREDICTION_HINTS): Remove.
        (TARGET_BRANCH_PREDICTION_HINTS): Remove.
        * config/i386/i386.c (initial_ix86_tune_fe): Remove initializer
        for X86_TUNE_BRANCH_PREDICTION_HINTS.
        (ix86_print_operand): Remove support for branch hints with '%+'.
        * config/i386/i386.md (conditional jump patterns): Remove branch
        prediction hints to the template.
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