Fix most clang warnings

- member initializing order in some constructors
- missing default branches in switch-case
- uninitialized variable if switch-case default (uncritical because
  program would exit)
- && and || brace warnings in if()

glslang/MachineIndependent/Initialize.cpp

@@ -1054,7 +1054,7 @@ void TBuiltIns::initialize(int version, EProfile profile)
     //
     //============================================================================
     bool esBarrier = (profile == EEsProfile && version >= 310);
-    if (profile != EEsProfile && version >= 150 || esBarrier)
+    if ((profile != EEsProfile && version >= 150) || esBarrier)
         stageBuiltins[EShLangTessControl].append(
             "void barrier();"
             );

glslang/MachineIndependent/Scan.cpp

@@ -685,7 +685,7 @@ int TScanContext::tokenizeIdentifier()
         return keyword;
 
     case ATOMIC_UINT:
-        if (parseContext.profile == EEsProfile && parseContext.version >= 310 ||
+        if ((parseContext.profile == EEsProfile && parseContext.version >= 310) ||
             parseContext.extensionsTurnedOn(1, &E_GL_ARB_shader_atomic_counters))
             return keyword;
         return es30ReservedFromGLSL(420);

glslang/MachineIndependent/Versions.cpp

@@ -457,6 +457,8 @@ bool TParseContext::extensionsTurnedOn(int numExtensions, const char* const exte
         case EBhRequire:
         case EBhWarn:
             return true;
+        default:
+            break;
         }
     }
 

glslang/MachineIndependent/preprocessor/PpContext.h

@@ -86,7 +86,7 @@ namespace glslang {
 
 class TPpToken {
 public:
-    TPpToken() : token(0), ival(0), space(false), dval(0.0), atom(0)
+    TPpToken() : token(0), space(false), ival(0), dval(0.0), atom(0)
     {
         loc.init(); 
         name[0] = 0;