[RFC][gdb/testsuite] Add -early pattern flag for gdb_test_multiple

[Tom de Vries]

Hi,

since you mentioned extending gdb_test_multiple functionality using new
pattern flags, I've rewritten the gdb_test_multiple part of this (
https://sourceware.org/ml/gdb-patches/2019-09/msg00221.html ) patch into
a patch that adds a '-early' pattern flag (which results in less
intrusive code changes than the previous attempt).

WDYT?

Thanks,
- Tom
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