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r11-4926 made __alignof__ get mangled differently from alignof, encoding __alignof__ as a vendor extended operator. But this mangling is problematic for the reasons mentioned in https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88115#c6. This patch changes our mangling of __alignof__ to instead use the new "vendor extended expression" syntax that's proposed in https://github.com/itanium-cxx-abi/cxx-abi/issues/112. Clang does the same thing already, so after this patch Clang and GCC agree about the mangling of __alignof__(type) and __alignof__(expr). gcc/cp/ChangeLog: PR c++/88115 * mangle.c (write_expression): Adjust the mangling of __alignof__. include/ChangeLog: PR c++/88115 * demangle.h (enum demangle_component_type): Add DEMANGLE_COMPONENT_VENDOR_EXPR. libiberty/ChangeLog: PR c++/88115 * cp-demangle.c (d_dump, d_make_comp, d_expression_1) (d_count_templates_scopes): Handle DEMANGLE_COMPONENT_VENDOR_EXPR. (d_print_comp_inner): Likewise. <case DEMANGLE_COMPONENT_EXTENDED_OPERATOR>: Revert r11-4926 change. <case DEMANGLE_COMPONENT_UNARY>: Likewise. * testsuite/demangle-expected: Adjust __alignof__ tests. gcc/testsuite/ChangeLog: PR c++/88115 * g++.dg/cpp0x/alignof7.C: Adjust expected mangling.
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