analyzer: g++ testsuite support

analyzer: g++ testsuite support

PR analyzer/93288 reports a C++-specific ICE with -fanalyzer.

This patch creates the beginnings of a C++ test suite for the analyzer,
so that there's a place to put test coverage for the fix.
It adds a regression test for PR analyzer/93212, an ICE fixed
in r10-5970-g32077b693df8e3ed0424031a322df23822bf2f7e.

gcc/testsuite/ChangeLog:
	PR analyzer/93212
	* g++.dg/analyzer/analyzer.exp: New subdirectory and .exp suite.
	* g++.dg/analyzer/malloc.C: New test.
	* g++.dg/analyzer/pr93212.C: New test.