[gdb/testsuite] Ignore pass in gdb_caching_proc

Before commit d4295de4f3 "[gdb/testsuite] Handle missing gnatmake in
gnat_runtime_has_debug_info", calling the gdb_caching_proc
gnat_runtime_has_debug_info could generate a pass because of using
gdb_compile_ada.

This has been fixed in that commit by using a factored out variant
gdb_compile_ada_1, which does not call pass.

Additionally, fix cases like this in more generic way: by ignoring pass calls
during execution of a gdb_caching_proc.

Build and reg-tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2020-02-19  Tom de Vries  <tdevries@suse.de>

	* lib/cache.exp (ignore_pass, gdb_do_cache_wrap): New proc.
	(gdb_do_cache): Use gdb_do_cache_wrap.
	* gdb.base/gdb-caching-proc.exp (test_proc): Use gdb_do_cache_wrap.

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