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[binutils-gdb] gdb: Fix left shift of negative value.

*** TEST RESULTS FOR COMMIT 66c6502d7a457057683f56fd6d606fd9b2da0655 ***

Author: Dominik Vogt <vogt@linux.vnet.ibm.com>
Branch: master
Commit: 66c6502d7a457057683f56fd6d606fd9b2da0655

gdb: Fix left shift of negative value.

This patch fixes all occurences of left-shifting negative constants in C cod
which is undefined by the C standard.

gdb/ChangeLog:

        * hppa-tdep.c (hppa_sign_extend, hppa_low_hppa_sign_extend)
        (prologue_inst_adjust_sp, hppa_frame_cache): Fix left shift of negative
        value.
        * dwarf2read.c (read_subrange_type): Likewise.
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