[Perl6::Actions] throw X::TypeCheck::Splice everywhere

This make the remaining two code paths for macros catch up
with the fact that we now throw X::TypeCheck::Splice when
a macro to be spliced into mainline code doesn't return
an AST. See also fc88876.

src/Perl6/Actions.pm

@@ -3531,10 +3531,11 @@ class Perl6::Actions is HLL::Actions {
                     return 1;
                 }
                 unless istype($quasi_ast, $ast_class) {
-                    $*W.throw($/, 'X::TypeCheck::MacroUnquote',
-                            got      => $quasi_ast,
-                            expected => $ast_class,
-                            symbol   => $*longname.text,
+                    $*W.throw('X::TypeCheck::Splice',
+                        got         => $quasi_ast,
+                        expected    => $ast_class,
+                        symbol      => $*longname.text,
+                        action      => 'macro application',
                     );
                 }
                 $past := QAST::Block.new(
@@ -3924,8 +3925,12 @@ class Perl6::Actions is HLL::Actions {
                     return 1;
                 }
                 unless istype($quasi_ast, $ast_class) {
-                    # XXX: Need to awesomeize with which type it got
-                    $/.CURSOR.panic('Macro did not return AST');
+                    $*W.throw('X::TypeCheck::Splice',
+                        got         => $quasi_ast,
+                        expected    => $ast_class,
+                        symbol      => $name,
+                        action      => 'macro application',
+                    );
                 }
                 my $past := QAST::Block.new(
                     :blocktype<raw>,