[Bug mi/21875] New: GDB/MI shouldn't print repeating values as <repeats 16 times>

["b7.10110111 at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21875

            Bug ID: 21875
           Summary: GDB/MI shouldn't print repeating values as <repeats 16
                    times>
           Product: gdb
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: mi
          Assignee: unassigned at sourceware dot org
          Reporter: b7.10110111 at gmail dot com
  Target Milestone: ---

Tested with GDB 8.0.50.20170801-git on x86_64 Linux system. Test command:

cat << EOF | gdb -i=mi
-file-exec-and-symbols /bin/true
-break-insert *0
-exec-run
-data-list-register-values r 40
EOF

The -data-list-register-values command prints SSE register as

^done,register-values=[{number="40",value="{v4_float = {0x00000000, 0x00000000,
0x00000000, 0x00000000}, v2_double = {0x0000000000000000, 0x0000000000000000},
v16_int8 = {0x00 <repeats 16 times>}, v8_int16 = {0x0000, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000}, v4_int32 = {0x00000000, 0x00000000,
0x00000000, 0x00000000}, v2_int64 = {0x0000000000000000, 0x0000000000000000},
uint128 = 0x00000000000000000000000000000000}"}]

Notice the "v16_int8 = {0x00 <repeats 16 times>}". This is not really
machine-friendly. All repetitions should be explicitly spelled out.

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