Tom de Vries 5b99c5718f [gdb/testsuite] Fix various issues in gdb.mi/mi-sym-info.exp
I noticed this failure in gdb.mi/mi-sym-info.exp with gcc-4.8:
...
FAIL: gdb.mi/mi-sym-info.exp: -symbol-info-functions --max-results 1 \
  (unexpected output)
...
due to function f2 instead of f3 being listed.

AFAICT, this is caused by a difference in debug info:
...
$ readelf -wi outputs/gdb.mi/mi-sym-info/mi-sym-info1.o \
  | egrep "DW_AT_name.*: f[1-3]"
    <72>   DW_AT_name        : f1
    <a1>   DW_AT_name        : f2
    <d0>   DW_AT_name        : f3
...
vs:
...
$ readelf -wi outputs/gdb.mi/mi-sym-info/mi-sym-info1.o \
  | egrep "DW_AT_name.*: f[1-3]"
    <f4>   DW_AT_name        : f3
    <123>   DW_AT_name        : f2
    <152>   DW_AT_name        : f1
...
and the command documentation does not mention an imposed order, so fix this
by allowing f2 as well.

Doing this fix, it made sense to do a refactoring of adding f2_re and f3_re
variables, in order to write (?:$f2_re|$f3_re), and I applied the same pattern
overall.

Furthermore, I found a silent FAIL due to calling mi_gdb_proc with 2 args, fix
by updating the regexp.

Then I ran with clang and found another FAIL, fix by updating the regexp.

Tested on x86_64-linux with gcc-4.8.5, gcc-7.5.0, gcc-11.2.1, clang-7.0.1 and
clang-12.0.1.
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