Fix some instances of -Wunused-but-set-variable.

Bug: chromium:1203071

SPIRV/GlslangToSpv.cpp

@@ -4400,7 +4400,6 @@ void TGlslangToSpvTraverser::decorateStructType(const glslang::TType& type,
 {
     // Name and decorate the non-hidden members
     int offset = -1;
-    int locationOffset = 0;  // for use within the members of this struct
     bool memberLocationInvalid = type.isArrayOfArrays() ||
         (type.isArray() && (type.getQualifier().isArrayedIo(glslangIntermediate->getStage()) == false));
     for (int i = 0; i < (int)glslangMembers->size(); i++) {
@@ -4458,10 +4457,6 @@ void TGlslangToSpvTraverser::decorateStructType(const glslang::TType& type,
         if (!memberLocationInvalid && memberQualifier.hasLocation())
             builder.addMemberDecoration(spvType, member, spv::DecorationLocation, memberQualifier.layoutLocation);
 
-        if (qualifier.hasLocation())      // track for upcoming inheritance
-            locationOffset += glslangIntermediate->computeTypeLocationSize(
-                                            glslangMember, glslangIntermediate->getStage());
-
         // component, XFB, others
         if (glslangMember.getQualifier().hasComponent())
             builder.addMemberDecoration(spvType, member, spv::DecorationComponent,

glslang/HLSL/hlslParseHelper.cpp

@@ -6689,12 +6689,6 @@ void HlslParseContext::globalQualifierFix(const TSourceLoc&, TQualifier& qualifi
 
 //
 // Merge characteristics of the 'src' qualifier into the 'dst'.
-// If there is duplication, issue error messages, unless 'force'
-// is specified, which means to just override default settings.
-//
-// Also, when force is false, it will be assumed that 'src' follows
-// 'dst', for the purpose of error checking order for versions
-// that require specific orderings of qualifiers.
 //
 void HlslParseContext::mergeQualifiers(TQualifier& dst, const TQualifier& src)
 {
@@ -6712,8 +6706,7 @@ void HlslParseContext::mergeQualifiers(TQualifier& dst, const TQualifier& src)
     mergeObjectLayoutQualifiers(dst, src, false);
 
     // individual qualifiers
-    bool repeated = false;
-#define MERGE_SINGLETON(field) repeated |= dst.field && src.field; dst.field |= src.field;
+#define MERGE_SINGLETON(field) dst.field |= src.field;
     MERGE_SINGLETON(invariant);
     MERGE_SINGLETON(noContraction);
     MERGE_SINGLETON(centroid);