[svn r325] Removed dead code.

Added license info to code from GDC (David Friedman permitted us to use the files under the Artistic License).
Added asmLabel check to DtoGoto to avoid jumping into inline asm. Doesn't work currently as LabelDsymbol::asmLabel is never set to true.

dmd/statement.c

@@ -3605,7 +3605,7 @@ LabelDsymbol::LabelDsymbol(Identifier *ident)
 	: Dsymbol(ident)
 {
     statement = NULL;
-    asmLabelNum = 0;
+    asmLabel = false;
 }
 
 LabelDsymbol *LabelDsymbol::isLabel()		// is this a LabelDsymbol()?

dmd/statement.h

@@ -767,7 +767,7 @@ struct LabelDsymbol : Dsymbol
 {
     LabelStatement *statement;
 // LLVMDC
-    unsigned asmLabelNum;       // for inline assembler labels
+    bool asmLabel;       // for labels inside inline assembler
 
     LabelDsymbol(Identifier *ident);
     LabelDsymbol *isLabel();