Add eqatic op for MoarVM to allow us to do testing

Is like eqat except it is case-insensitive.

Author: samcv

docs/ops.markdown

@@ -591,6 +591,13 @@ and 1 if $r is greater than $l.
 Return 1 if the string `$haystack` has the string `$needle` at position `$pos`,
 or 0 otherwise.
 
+## eqatic
+MoarVM only
+
+* `eqatic(str haystack, str $needle, int $pos)`
+
+Case insensitive version of eqat
+
 ## iseq
 * `iseq_i(int $l, int $r)`
 * `iseq_n(num $l, num $r)`

src/vm/moar/QAST/QASTOperationsMAST.nqp

@@ -2287,6 +2287,7 @@ QAST::MASTOperations.add_core_op('tclc', -> $qastcomp, $op {
 });
 
 QAST::MASTOperations.add_core_moarop_mapping('eqat', 'eqat_s');
+QAST::MASTOperations.add_core_moarop_mapping('eqatic', 'eqatic_s');
 
 QAST::MASTOperations.add_core_op('substr', -> $qastcomp, $op {
     my @operands := $op.list;