d/dmd: Merge dmd upstream e21c07e84

Fixes bootstrap regression introduced by the previous merge.

Reviewed-on: https://github.com/dlang/dmd/pull/9283

From-SVN: r268167

gcc/d/dmd/MERGE

-180465274b72a2ff218449f6793af0fbaabbcaa3
+e21c07e84bd9668e1c0fc1f45e514c5fd76988e7
 
 The first line of this file holds the git revision number of the last
 merge done from the dlang/dmd repository.

gcc/d/dmd/mtype.c

@@ -2326,7 +2326,7 @@ Identifier *Type::getTypeInfoIdent()
 
     int length = sprintf(name, "_D%lluTypeInfo_%s6__initZ", (unsigned long long) 9 + len, buf.data);
     //printf("%p, deco = %s, name = %s\n", this, deco, name);
-    assert(0 < length && length < namelen);     // don't overflow the buffer
+    assert(0 < length && (size_t)length < namelen);     // don't overflow the buffer
 
     Identifier *id = Identifier::idPool(name, length);