Make build of NQP modules reproducible

By replacing timestamps in the compilation unit's id with a counter and in
construction of unique alt_nfs ids with the compilation unit's id, we get
reproducible builds. Simple rebuilds without changes to the source will no
longer lead to "Missing or wrong version of dependency" messages.

Author: niner

src/NQP/Grammar.nqp

@@ -1,4 +1,5 @@
 grammar NQP::Grammar is HLL::Grammar {
+    my $sc_id := 0;
     method TOP() {
 	    # Language braid.
 	    my $*LANG := self;
@@ -23,7 +24,7 @@ grammar NQP::Grammar is HLL::Grammar {
         # with this compilation unit.
         my $file := nqp::getlexdyn('$?FILES');
         my $source_id := nqp::sha1(self.target()) ~
-            (%*COMPILING<%?OPTIONS><stable-sc> ?? '' !! '-' ~ ~nqp::time_n());
+            (%*COMPILING<%?OPTIONS><stable-sc> ?? '' !! '-' ~ ~($sc_id++));
         my $*W := nqp::isnull($file) ??
             NQP::World.new(:handle($source_id)) !!
             NQP::World.new(:handle($source_id), :description($file));

src/QRegex/P6Regex/Actions.nqp

@@ -946,7 +946,7 @@ class QRegex::P6Regex::Actions is HLL::Actions {
                 self.alt_nfas($code_obj, $block, $_);
                 nqp::push(@alternatives, QRegex::NFA.new.addnode($_));
             }
-            $ast.name(QAST::Node.unique('alt_nfa_') ~ '_' ~ ~nqp::time_n());
+            $ast.name(QAST::Node.unique('alt_nfa_') ~ '_' ~ $*W.handle());
             self.store_regex_alt_nfa($code_obj, $block, $ast.name, @alternatives);
         }
         elsif $rxtype eq 'subcapture' || $rxtype eq 'quant' {