Regressions on master at commit r11-7571 vs commit r11-7549 on Linux/x86_64

[H.J. Lu]

New failures:
FAIL: g++.dg/modules/builtin-3_a.C -std=c++2b  scan-lang-dump module "Writing:-[0-9]*'s named merge key \\(decl\\) type_decl:'::__builtin_va_list'"
FAIL: g++.dg/modules/builtin-3_a.C -std=c++2b  scan-lang-dump module "Wrote GMF:-[0-9]* type_decl:'::__builtin_va_list'@builtins"
FAIL: g++.dg/modules/builtin-3_b.C -std=c++2b  scan-lang-dump module "Read:-[0-9]*'s named merge key \\(matched\\) type_decl:'::__builtin_va_list'"
FAIL: g++.dg/modules/xtreme-header-5_c.C -std=c++17 (internal compiler error)
FAIL: g++.dg/modules/xtreme-header-5_c.C -std=c++17 (test for excess errors)

New passes:
FAIL: libstdc++-prettyprinters/48362.cc print t1
FAIL: libstdc++-prettyprinters/cxx11.cc print rarrptr
FAIL: libstdc++-prettyprinters/cxx11.cc print rarrptr
FAIL: libstdc++-prettyprinters/cxx11.cc print rarrptr
FAIL: libstdc++-prettyprinters/cxx11.cc print rempty_ptr
FAIL: libstdc++-prettyprinters/cxx11.cc print rempty_ptr
FAIL: libstdc++-prettyprinters/cxx11.cc print rempty_ptr
FAIL: libstdc++-prettyprinters/cxx11.cc print reums
FAIL: libstdc++-prettyprinters/cxx11.cc print reums
FAIL: libstdc++-prettyprinters/cxx11.cc print reums
FAIL: libstdc++-prettyprinters/cxx11.cc print ruom
FAIL: libstdc++-prettyprinters/cxx11.cc print ruom
FAIL: libstdc++-prettyprinters/cxx11.cc print ruom
FAIL: libstdc++-prettyprinters/cxx11.cc print ruomm
FAIL: libstdc++-prettyprinters/cxx11.cc print ruomm
FAIL: libstdc++-prettyprinters/cxx11.cc print ruomm
FAIL: libstdc++-prettyprinters/cxx11.cc print ruoms
FAIL: libstdc++-prettyprinters/cxx11.cc print ruoms
FAIL: libstdc++-prettyprinters/cxx11.cc print ruoms
FAIL: libstdc++-prettyprinters/cxx11.cc print ruos
FAIL: libstdc++-prettyprinters/cxx11.cc print ruos
FAIL: libstdc++-prettyprinters/cxx11.cc print ruos
FAIL: libstdc++-prettyprinters/cxx11.cc print ruptr
FAIL: libstdc++-prettyprinters/cxx11.cc print ruptr
FAIL: libstdc++-prettyprinters/cxx11.cc print ruptr
FAIL: libstdc++-prettyprinters/cxx17.cc print a
FAIL: libstdc++-prettyprinters/cxx17.cc print ab
FAIL: libstdc++-prettyprinters/cxx17.cc print ai
FAIL: libstdc++-prettyprinters/cxx17.cc print al
FAIL: libstdc++-prettyprinters/cxx17.cc print am
FAIL: libstdc++-prettyprinters/cxx17.cc print ap
FAIL: libstdc++-prettyprinters/cxx17.cc print as
FAIL: libstdc++-prettyprinters/cxx17.cc print as2
FAIL: libstdc++-prettyprinters/cxx17.cc print p
FAIL: libstdc++-prettyprinters/cxx17.cc print path0
FAIL: libstdc++-prettyprinters/cxx17.cc print path1
FAIL: libstdc++-prettyprinters/cxx17.cc print q
FAIL: libstdc++-prettyprinters/cxx17.cc print v0
FAIL: libstdc++-prettyprinters/cxx17.cc print v1
FAIL: libstdc++-prettyprinters/cxx17.cc print v2
FAIL: libstdc++-prettyprinters/cxx17.cc print v3
FAIL: libstdc++-prettyprinters/cxx17.cc print v4
FAIL: libstdc++-prettyprinters/cxx17.cc print wp
FAIL: libstdc++-prettyprinters/cxx17.cc print wq
FAIL: libstdc++-prettyprinters/libfundts.cc print a
FAIL: libstdc++-prettyprinters/libfundts.cc print a
FAIL: libstdc++-prettyprinters/libfundts.cc print a
FAIL: libstdc++-prettyprinters/libfundts.cc print ab
FAIL: libstdc++-prettyprinters/libfundts.cc print ab
FAIL: libstdc++-prettyprinters/libfundts.cc print ab
FAIL: libstdc++-prettyprinters/libfundts.cc print ai
FAIL: libstdc++-prettyprinters/libfundts.cc print ai
FAIL: libstdc++-prettyprinters/libfundts.cc print ai
FAIL: libstdc++-prettyprinters/libfundts.cc print ap
FAIL: libstdc++-prettyprinters/libfundts.cc print ap
FAIL: libstdc++-prettyprinters/libfundts.cc print ap
FAIL: libstdc++-prettyprinters/libfundts.cc print as
FAIL: libstdc++-prettyprinters/libfundts.cc print as
FAIL: libstdc++-prettyprinters/libfundts.cc print as
FAIL: libstdc++-prettyprinters/libfundts.cc print as2
FAIL: libstdc++-prettyprinters/libfundts.cc print as2
FAIL: libstdc++-prettyprinters/libfundts.cc print as2
FAIL: libstdc++-prettyprinters/libfundts.cc print om
FAIL: libstdc++-prettyprinters/libfundts.cc print om
FAIL: libstdc++-prettyprinters/libfundts.cc print om
FAIL: libstdc++-prettyprinters/libfundts.cc print op
FAIL: libstdc++-prettyprinters/libfundts.cc print op
FAIL: libstdc++-prettyprinters/libfundts.cc print op
FAIL: libstdc++-prettyprinters/libfundts.cc print os
FAIL: libstdc++-prettyprinters/libfundts.cc print os
FAIL: libstdc++-prettyprinters/libfundts.cc print os