Add extra break statements to quiet clang warnings.

Clang complains about code that falls through into an empty default
case, so add some breaks to placate it.

SPIRV/GlslangToSpv.cpp

@@ -1165,6 +1165,7 @@ spv::ImageFormat TGlslangToSpvTraverser::TranslateImageFormat(const glslang::TTy
     case glslang::ElfR64i:
         builder.addExtension(spv::E_SPV_EXT_shader_image_int64);
         builder.addCapability(spv::CapabilityInt64ImageEXT);
+        break;
     default:
         break;
     }

glslang/HLSL/hlslGrammar.cpp

@@ -391,6 +391,7 @@ bool HlslGrammar::acceptDeclaration(TIntermNode*& nodeList)
     case EvqOut:
     case EvqInOut:
         parseContext.error(token.loc, "in/out qualifiers are only valid on parameters", token.string->c_str(), "");
+        break;
     default:
         break;
     }

glslang/MachineIndependent/Intermediate.cpp

@@ -376,6 +376,7 @@ TIntermTyped* TIntermediate::addUnaryMath(TOperator op, TIntermTyped* child,
     case EOpNegative:
         if (child->getType().getBasicType() == EbtStruct || child->getType().isArray())
             return nullptr;
+        break;
     default: break; // some compilers want this
     }
 
@@ -3490,6 +3491,7 @@ bool TIntermediate::promoteBinary(TIntermBinary& node)
         // check for non-Boolean operands
         if (left->getBasicType() == EbtBool || right->getBasicType() == EbtBool)
             return false;
+        break;
 
     default:
         break;
@@ -3540,6 +3542,7 @@ bool TIntermediate::promoteBinary(TIntermBinary& node)
         // At least the basic type has to match
         if (left->getBasicType() != right->getBasicType())
             return false;
+        break;
 
     default:
         break;

glslang/MachineIndependent/ParseContextBase.cpp

@@ -257,6 +257,7 @@ void TParseContextBase::rValueErrorCheck(const TSourceLoc& loc, const char* op,
             case EOpVectorSwizzle:
             case EOpMatrixSwizzle:
                 rValueErrorCheck(loc, op, binaryNode->getLeft());
+                break;
             default:
                 break;
             }

glslang/MachineIndependent/ShaderLang.cpp

@@ -633,6 +633,7 @@ bool DeduceVersionProfile(TInfoSink& infoSink, EShLanguage stage, bool versionNo
             infoSink.info.message(EPrefixError, "#version: mesh/task shaders require es profile with version 320 or above, or non-es profile with version 450 or above");
             version = profile == EEsProfile ? 320 : 450;
         }
+        break;
     default:
         break;
     }

glslang/MachineIndependent/SymbolTable.cpp

@@ -149,6 +149,7 @@ void TType::buildMangledName(TString& mangledName) const
             mangledName += '-';
             (*structure)[i].type->buildMangledName(mangledName);
         }
+        break;
     default:
         break;
     }