Externals: Update glslang.

This updates glslang to commit 9bb8cfffb0eed010e07132282c41d73064a7a609
which is the current version listed in the known_good.json file for the
version 1.3.212 of the Vulkan-ValidationLayers repo.

Externals/glslang/SPIRV/spvIR.h

@@ -55,6 +55,7 @@
 #include <iostream>
 #include <memory>
 #include <vector>
+#include <set>
 
 namespace spv {
 
@@ -110,27 +111,23 @@ public:
 
     void addStringOperand(const char* str)
     {
-        unsigned int word;
-        char* wordString = (char*)&word;
-        char* wordPtr = wordString;
-        int charCount = 0;
+        unsigned int word = 0;
+        unsigned int shiftAmount = 0;
         char c;
+
         do {
             c = *(str++);
-            *(wordPtr++) = c;
-            ++charCount;
-            if (charCount == 4) {
+            word |= ((unsigned int)c) << shiftAmount;
+            shiftAmount += 8;
+            if (shiftAmount == 32) {
                 addImmediateOperand(word);
-                wordPtr = wordString;
-                charCount = 0;
+                word = 0;
+                shiftAmount = 0;
             }
         } while (c != 0);
 
         // deal with partial last word
-        if (charCount > 0) {
-            // pad with 0s
-            for (; charCount < 4; ++charCount)
-                *(wordPtr++) = 0;
+        if (shiftAmount > 0) {
             addImmediateOperand(word);
         }
     }
@@ -235,8 +232,7 @@ public:
         assert(instructions.size() > 0);
         instructions.resize(1);
         successors.clear();
-        Instruction* unreachable = new Instruction(OpUnreachable);
-        addInstruction(std::unique_ptr<Instruction>(unreachable));
+        addInstruction(std::unique_ptr<Instruction>(new Instruction(OpUnreachable)));
     }
     // Change this block into a canonical dead continue target branching to the
     // given header ID.  Delete instructions as necessary.  A canonical dead continue
@@ -263,6 +259,7 @@ public:
         case OpBranchConditional:
         case OpSwitch:
         case OpKill:
+        case OpTerminateInvocation:
         case OpReturn:
         case OpReturnValue:
         case OpUnreachable:
@@ -352,10 +349,28 @@ public:
     const std::vector<Block*>& getBlocks() const { return blocks; }
     void addLocalVariable(std::unique_ptr<Instruction> inst);
     Id getReturnType() const { return functionInstruction.getTypeId(); }
+    void setReturnPrecision(Decoration precision)
+    {
+        if (precision == DecorationRelaxedPrecision)
+            reducedPrecisionReturn = true;
+    }
+    Decoration getReturnPrecision() const
+        { return reducedPrecisionReturn ? DecorationRelaxedPrecision : NoPrecision; }
 
     void setImplicitThis() { implicitThis = true; }
     bool hasImplicitThis() const { return implicitThis; }
 
+    void addParamPrecision(unsigned param, Decoration precision)
+    {
+        if (precision == DecorationRelaxedPrecision)
+            reducedPrecisionParams.insert(param);
+    }
+    Decoration getParamPrecision(unsigned param) const
+    {
+        return reducedPrecisionParams.find(param) != reducedPrecisionParams.end() ?
+            DecorationRelaxedPrecision : NoPrecision;
+    }
+
     void dump(std::vector<unsigned int>& out) const
     {
         // OpFunction
@@ -380,6 +395,8 @@ protected:
     std::vector<Instruction*> parameterInstructions;
     std::vector<Block*> blocks;
     bool implicitThis;  // true if this is a member function expecting to be passed a 'this' as the first argument
+    bool reducedPrecisionReturn;
+    std::set<int> reducedPrecisionParams;  // list of parameter indexes that need a relaxed precision arg
 };
 
 //
@@ -440,7 +457,8 @@ protected:
 // - the OpFunction instruction
 // - all the OpFunctionParameter instructions
 __inline Function::Function(Id id, Id resultType, Id functionType, Id firstParamId, Module& parent)
-    : parent(parent), functionInstruction(id, resultType, OpFunction), implicitThis(false)
+    : parent(parent), functionInstruction(id, resultType, OpFunction), implicitThis(false),
+      reducedPrecisionReturn(false)
 {
     // OpFunction
     functionInstruction.addImmediateOperand(FunctionControlMaskNone);