* src/SDCCdwarf2.c (dwMatchTypes): structs must have matching

* src/SDCCdwarf2.c (dwMatchTypes): structs must have matching
SPEC_STRUCT
* src/SDCCdwarf2.c (dwTagFromType): fix to handle recursive
struct definitions
* src/SDCCdwarf2.c (dwWriteModule, dwNewDebugSymbol, dwWriteEndFunction,
dwWriteLabel): fix to create valid debugger symbols even when
the module name has non-alphanumeric symbols in it
* src/SDCCdwarf2.c (dwWriteSymbolInternal): better detection for
when a variable's allocation has been optimized away

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@3306 4a8a32a2-be11-0410-ad9d-d568d2c75423