4864 – ICE(statement.c) Crash on invalid 'if statement' body inside mixin

----- reduced test case -----
void main()
{
 mixin("if (0) % ;");
}
-----------------------------
IfStatement::semantic is called with (ifbody == null)
Seems like something that should be detected during parsing of the mixin.

Additional test case:
void main()
{
	mixin("if (a b) ;");
}
Another case of a broken if statement.
The crash goes away if a body is added to the if statement.

PATCH: statement.c 337.
CompileStatement::flatten()
 Statements *a = new Statements();
 while (p.token.value != TOKeof)
 {
+ int olderrs = global.errors;
 Statement *s = p.parseStatement(PSsemi | PScurlyscope);
+ if (olderrs == global.errors) // discard it if parsing failed
 a->push(s);
 }

http://www.dsource.org/projects/dmd/changeset/778 

http://www.dsource.org/projects/dmd/changeset/778