HLSL: Fix unary and binary operator type conversion issues

This fixes defects as follows:

1. handleLvalue could be called on a non-L-value, and it shouldn't be.

2. HLSL allows unary negation on non-bool values.  TUnaryOperator::promote
   can now promote other types (e.g, int, float) to bool for this op.

3. HLSL allows binary logical operations (&&, ||) on arbitrary types, similar
   (2).

4. HLSL allows mod operation on arbitrary types, which will be promoted.
   E.g, int % float -> float % float.

hlsl/hlslParseables.cpp

@@ -245,7 +245,6 @@ glslang::TString& AppendTypeName(glslang::TString& s, const char* argOrder, cons
     char order = *argOrder;
 
     if (UseHlslTypes) {
-        // TODO: handle sub-vec4 returns
         switch (type) {
         case '-': s += "void";                                            break;
         case 'F': s += "float";                                           break;
@@ -832,8 +831,6 @@ void TBuiltInParseablesHlsl::initialize(int /*version*/, EProfile /*profile*/, c
         { "GatherCmpAlpha",  /* O-4 */        "V4",    nullptr,   "%@,S,V,S,V,,,",  "FIU,s,F,,I,,,",  EShLangAll },
         { "GatherCmpAlpha",  /* O-4, status */"V4",    nullptr,   "%@,S,V,S,V,,,,S","FIU,s,F,,I,,,,U",EShLangAll },
 
-        // TODO: Cmp forms
-
         // Mark end of list, since we want to avoid a range-based for, as some compilers don't handle it yet.
         { nullptr,                            nullptr, nullptr,   nullptr,      nullptr,  0 },
     };