Fix misc-misplaced-const warnings in Yoga tests (facebook#1677)

Summary:
Pull Request resolved: facebook#1677

We have Clang Tidy warnings enabled internally, that will flag `const YG*Ref` as misleading, as a const pointer to non-const, instead of non-const pointer to const.

Let's remove all the misleading const in existing tests, and generated tests.

Reviewed By: joevilches

Differential Revision: D59335968

fbshipit-source-id: c66af878904ba7900f8ffcd99162968d90f8e5c7

Author: NickGerleman

gentest/gentest-cpp.js

@@ -49,7 +49,7 @@ CPPEmitter.prototype = Object.create(Emitter.prototype, {
         this.push('');
       }
 
-      this.push('const YGConfigRef config = YGConfigNew();');
+      this.push('YGConfigRef config = YGConfigNew();');
       for (const i in experiments) {
         this.push(
           'YGConfigSetExperimentalFeatureEnabled(config, YGExperimentalFeature' +
@@ -63,9 +63,7 @@ CPPEmitter.prototype = Object.create(Emitter.prototype, {
 
   emitTestTreePrologue: {
     value: function (nodeName) {
-      this.push(
-        'const YGNodeRef ' + nodeName + ' = YGNodeNewWithConfig(config);',
-      );
+      this.push('YGNodeRef ' + nodeName + ' = YGNodeNewWithConfig(config);');
     },
   },
 

tests/FlexGapTest.cpp

@@ -11,26 +11,26 @@
 // TODO: move this to a fixture based test once it supports parsing negative
 // values
 TEST(FlexGap, gap_negative_value) {
-  const YGConfigRef config = YGConfigNew();
+  YGConfigRef config = YGConfigNew();
 
-  const YGNodeRef root = YGNodeNewWithConfig(config);
+  YGNodeRef root = YGNodeNewWithConfig(config);
   YGNodeStyleSetFlexDirection(root, YGFlexDirectionRow);
   YGNodeStyleSetGap(root, YGGutterAll, -20);
   YGNodeStyleSetHeight(root, 200);
 
-  const YGNodeRef root_child0 = YGNodeNewWithConfig(config);
+  YGNodeRef root_child0 = YGNodeNewWithConfig(config);
   YGNodeStyleSetWidth(root_child0, 20);
   YGNodeInsertChild(root, root_child0, 0);
 
-  const YGNodeRef root_child1 = YGNodeNewWithConfig(config);
+  YGNodeRef root_child1 = YGNodeNewWithConfig(config);
   YGNodeStyleSetWidth(root_child1, 20);
   YGNodeInsertChild(root, root_child1, 1);
 
-  const YGNodeRef root_child2 = YGNodeNewWithConfig(config);
+  YGNodeRef root_child2 = YGNodeNewWithConfig(config);
   YGNodeStyleSetWidth(root_child2, 20);
   YGNodeInsertChild(root, root_child2, 2);
 
-  const YGNodeRef root_child3 = YGNodeNewWithConfig(config);
+  YGNodeRef root_child3 = YGNodeNewWithConfig(config);
   YGNodeStyleSetWidth(root_child3, 20);
   YGNodeInsertChild(root, root_child3, 3);
   YGNodeCalculateLayout(root, YGUndefined, YGUndefined, YGDirectionLTR);