Merge pull request #1733 from null77/fix-msvc-warn

Suppress MSVC warning about unused variable.

BUILD.gn

@@ -152,6 +152,7 @@ source_set("glslang_sources") {
   if (is_win && !is_clang) {
     cflags = [
       "/wd4018", # signed/unsigned mismatch
+      "/wd4189", # local variable is initialized but not referenced
     ]
   }
 

SPIRV/SpvPostProcess.cpp

@@ -258,6 +258,7 @@ void Builder::postProcess(Instruction& inst)
                 assert(inst.getNumOperands() >= 3);
                 unsigned int memoryAccess = inst.getImmediateOperand((inst.getOpCode() == OpStore) ? 2 : 1);
                 assert(memoryAccess & MemoryAccessAlignedMask);
+                static_cast<void>(memoryAccess);
                 // Compute the index of the alignment operand.
                 int alignmentIdx = 2;
                 if (inst.getOpCode() == OpStore)