c-pretty-print.cc (pp_c_tree_decl_identifier): Strip private name encoding, PR118303

This is a part of PR118303.  It fixes
FAIL: gcc.dg/analyzer/CVE-2005-1689-minimal.c (test for excess errors)
FAIL: gcc.dg/analyzer/CVE-2005-1689-minimal.c inbuf.data (test for warnings, line 62)
for targets where the parameter on that line is subject to
TARGET_CALLEE_COPIES being true.

c-family:
	PR middle-end/118303
	* c-pretty-print.cc (c_pretty_printer::primary_expression) <SSA_NAME>:
	Call primary_expression for all SSA_NAME_VAR nodes and instead move the
	DECL_ARTIFICIAL private name stripping to...
	(pp_c_tree_decl_identifier): ...here.