Update for VS2019 Preview 2 which introduced another ICE related to modules

Author: fdwr

Common.FastVector.h

@@ -550,7 +550,7 @@ class fast_vector<T, 0, ShouldInitializeElements>
         {
             // Try to just reallocate the existing memory block.
 
-            void* memory = realloc(GetMemoryBlock(data_), newByteSize);
+            void* memory = std::realloc(GetMemoryBlock(data_), newByteSize);
             if (memory == nullptr && newByteSize > 0)
             {
                 throw std::bad_alloc();

Common.FastVector.ixx

@@ -4,9 +4,9 @@
 
 // For whatever inane reason, VS complains here but not in other files.
 // error C7577: a global module fragment can only appear at the start of a translation unit
-// #if USE_CPP_MODULES
+#if USE_CPP_MODULES
     module;
-// #endif
+#endif
 
 #include "precomp.h"
 

Common.h

@@ -3,11 +3,13 @@
 //----------------------------------------------------------------------------
 #pragma once
 
+#ifndef USE_CPP_MODULES
 #ifdef __cpp_modules
 #define USE_CPP_MODULES 1
-#elif !defined(USE_CPP_MODULES)
+#else
 #define USE_CPP_MODULES 0
 #endif
+#endif
 
 
 #if USE_CPP_MODULES // Is there no __cpp_modules feature test macro?

FileHelpers.ixx

@@ -4,7 +4,9 @@
 //  History:    2013-10-04   Dwayne Robinson - Created
 //----------------------------------------------------------------------------
 
+#if USE_CPP_MODULES
 module;
+#endif
 
 #include "precomp.h"
 

TextLayoutSampler.vcxproj

@@ -61,7 +61,7 @@
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <UndefinePreprocessorDefinitions>
       </UndefinePreprocessorDefinitions>
-      <PrecompiledHeader>Use</PrecompiledHeader>
+      <PrecompiledHeader>NotUsing</PrecompiledHeader>
       <PrecompiledHeaderFile>precomp.h</PrecompiledHeaderFile>
       <AdditionalOptions>/ifcSearchDir $(IntDir)</AdditionalOptions>
       <AdditionalIncludeDirectories>