libiberty/ChangeLog:
* d-demangle.c (dlang_call_convention): Handle extern Objective-C
function calling convention.
(dlang_call_convention_p): Likewise.
(dlang_type): Likewise.
* testsuite/d-demangle-expected: Add coverage tests.
* d-demangle.c (dlang_function_args): Append ',' for variadic functions
only if parameters were seen before the elipsis symbol.
* testsuite/d-demangle-expected: Add coverage test for parameter-less
variadic functions.
* d-demangle.c (dlang_type): Handle function types only in the context
of seeing a pointer type symbol.
* testsuite/d-demangle-expected: Update function pointer tests.
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