add some comments & todos, fix add a header to a project group

Author: Krovatkin

lib/Backend/LowerMDSharedSimd128.cpp

@@ -2622,6 +2622,7 @@ IR::Instr* LowererMD::Simd128LowerAllTrue(IR::Instr* instr)
     instr->InsertBefore(pInstr);
 
     //horizontally OR into 0th and 2nd positions
+    //TODO nikolayk revisit the sequence for in64x2.alltrue
     IR::Opnd* newDst = dst;
     uint cmpMask = 0xFFFF;
     if (instr->m_opcode == Js::OpCode::Simd128_AllTrue_B2) 

lib/Runtime/Language/Chakra.Runtime.Language.vcxproj

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" ToolsVersion="12.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <Import Condition="'$(ChakraBuildPathImported)'!='true'" Project="$(SolutionDir)Chakra.Build.Paths.props" />
   <Import Project="$(BuildConfigPropsPath)Chakra.Build.ProjectConfiguration.props" />
@@ -241,6 +241,7 @@
     <ClInclude Include="JavascriptStackWalker.h" />
     <ClInclude Include="SimdFloat32x4Operation.h" />
     <ClInclude Include="SimdFloat64x2Operation.h" />
+    <ClInclude Include="SimdInt64x2Operation.h" />
     <ClInclude Include="SimdInt32x4Operation.h" />
     <ClInclude Include="SimdInt16x8Operation.h" />
     <ClInclude Include="SimdInt8x16Operation.h" />

lib/Runtime/Language/SimdInt64x2Operation.h

@@ -12,6 +12,10 @@ namespace Js {
         static SIMDValue OpAdd(const SIMDValue& a, const SIMDValue& b);
         static SIMDValue OpSub(const SIMDValue& a, const SIMDValue& b);
         static SIMDValue OpNeg(const SIMDValue& a);
+
+        //pointer-based arguments are used to ensure that calling conventions are consistent across x86/x64
+        //and match call sequences JIT generates.
+        //TODO: nikolayk back to "const SIMDValue& a"
         static void OpShiftLeftByScalar(SIMDValue* dst, SIMDValue* src, int count);
         static void OpShiftRightByScalar(SIMDValue* dst, SIMDValue* src, int count);
         static void OpShiftRightByScalarU(SIMDValue* dst, SIMDValue* src, int count);