Change references of HLL language to 'Raku'

I'm not sure why there are *any* references to any implementation
of a HLL languages in NQP.  But it appears there are.  Change them
from 'perl6' to 'Raku', in preparation for a similar renaming action
for Rakudo.

src/QRegex/Cursor.nqp

@@ -89,7 +89,7 @@ role NQPMatchRole is export {
     method PRECURSOR() { self."!cursor_init"(nqp::getattr_s($!shared, ParseShared, '$!target'), :p($!from)) }
     method Str()       { $!pos >= $!from ?? nqp::substr(nqp::getattr_s($!shared, ParseShared, '$!target'), $!from, nqp::sub_i(self.to, $!from)) !! '' }
     method Num()       { nqp::numify(self.Str()) }
-    method Int()       { nqp::hllizefor(self.Str, 'perl6').Int }
+    method Int()       { nqp::hllizefor(self.Str, 'Raku').Int }
     method Bool()      { $!pos >= $!from }
     method chars()     { $!pos >= $!from ?? nqp::sub_i(self.to, $!from) !! 0 }
 

src/vm/js/Compiler.nqp

@@ -291,7 +291,7 @@ class QAST::CompilerJS does DWIMYNameMangling does SerializeOnce {
 
         return 0 if $var.scope eq 'local';
 
-        if $*HLL eq 'perl6' { # To make binding of signatures work
+        if $*HLL eq 'Raku' { # To make binding of signatures work
             return 1;
         }
 

src/vm/js/nqp-runtime/core.js

@@ -629,11 +629,11 @@ function fromJSToReturnValue(ctx, obj) {
 exports.fromJSToReturnValue = fromJSToReturnValue;
 
 function fromJSToArgument(obj) {
-  return fromJS(hll.getHLL('perl6'), obj, false, true);
+  return fromJS(hll.getHLL('Raku'), obj, false, true);
 }
 
 function fromJSToObject(ctx, obj) {
-  return fromJS(hll.getHLL('perl6'), obj, false, false);
+  return fromJS(hll.getHLL('Raku'), obj, false, false);
 }
 
 function fromJS(HLL, obj, isReturnValue, isArgument) {
@@ -1016,7 +1016,7 @@ const fakePerl6 = new FakePerl6();
 op.getcomp = function(language) {
   const compilerRegistry = globalContext.context.compilerRegistry;
 
-  if (language === 'perl6' && !compilerRegistry.has(language)) {
+  if (language === 'Raku' && !compilerRegistry.has(language)) {
     return fakePerl6;
   }
 

src/vm/js/nqp-runtime/runtime.js

@@ -481,7 +481,7 @@ exports.createIntArray = require('./BOOT.js').createIntArray;
 
 const containerSpecs = require('./container-specs.js');
 exports.extraRuntime = function(lang, path) {
-  if (lang != 'perl6') throw 'only loading extra runtime for perl 6 is supported';
+  if (lang != 'Raku') throw 'only loading extra runtime for Raku is supported';
   const runtime = typeof path === 'string' ? require(path) : path.require(lang + '-runtime');
   if (!runtime.loaded) {
     runtime.loaded = true;

src/vm/moar/HLL/Backend.nqp

@@ -162,7 +162,7 @@ class HLL::Backend::MoarVM {
             $conf-hash := nqp::hash('kind', $kind);
         }
 
-        my @END := nqp::gethllsym('perl6', '@END_PHASERS');
+        my @END := nqp::gethllsym('Raku', '@END_PHASERS');
         @END.push(-> { self.dump_profile_data($prof_end_sub(), $kind, $filename) })
             if nqp::defined(@END);