Cleanup: fewer iostreams related includes in Cycles

In the commonly used cycles headers, it's enough to include
much smaller <iosfwd> than the full <iostream>. While looking at it,
removed inclusion of some other headers from commonly used headers,
that seemed to not be needed.

Pull Request: https://projects.blender.org/blender/blender/pulls/111063

intern/cycles/blender/id_map.h

@@ -12,7 +12,6 @@
 
 #include "util/map.h"
 #include "util/set.h"
-#include "util/vector.h"
 
 CCL_NAMESPACE_BEGIN
 

intern/cycles/bvh/params.h

@@ -9,6 +9,7 @@
 #define __BVH_PARAMS_H__
 
 #include "util/boundbox.h"
+#include "util/vector.h"
 
 #include "kernel/types.h"
 

intern/cycles/device/kernel.h

@@ -9,7 +9,7 @@
 
 #  include "util/string.h"
 
-#  include <ostream>  // NOLINT
+#  include <iosfwd>
 #endif
 
 CCL_NAMESPACE_BEGIN

intern/cycles/integrator/tile.h

@@ -4,7 +4,7 @@
 
 #pragma once
 
-#include <ostream>
+#include <iosfwd>
 
 #include "util/types.h"
 

intern/cycles/scene/osl.cpp

@@ -704,7 +704,7 @@ OSLCompiler::OSLCompiler(OSLShaderManager *manager, OSL::ShadingSystem *ss, Scen
 string OSLCompiler::id(ShaderNode *node)
 {
   /* assign layer unique name based on pointer address + bump mode */
-  stringstream stream;
+  std::stringstream stream;
 
   /* Ensure that no grouping characters (e.g. commas with en_US locale)
    * are added to the pointer string. */
@@ -1205,7 +1205,7 @@ OSL::ShaderGroupRef OSLCompiler::compile_type(Shader *shader, ShaderGraph *graph
   current_type = type;
 
   /* Use name hash to identify shader group to avoid issues with non-alphanumeric characters */
-  stringstream name;
+  std::stringstream name;
   name.imbue(std::locale("C"));
   name << "shader_" << shader->name.hash();
 

intern/cycles/scene/pass.h

@@ -4,7 +4,7 @@
 
 #pragma once
 
-#include <ostream>  // NOLINT
+#include <iosfwd>
 
 #include "util/string.h"
 #include "util/vector.h"

intern/cycles/scene/scene.h

@@ -14,7 +14,6 @@
 
 #include "util/param.h"
 #include "util/string.h"
-#include "util/system.h"
 #include "util/texture.h"
 #include "util/thread.h"
 

intern/cycles/util/boundbox.h

@@ -9,7 +9,6 @@
 #include <math.h>
 
 #include "util/math.h"
-#include "util/string.h"
 #include "util/transform.h"
 #include "util/types.h"
 

intern/cycles/util/debug.h

@@ -6,7 +6,6 @@
 #define __UTIL_DEBUG_H__
 
 #include <cassert>
-#include <iostream>
 
 #include "bvh/params.h"
 

intern/cycles/util/log.h

@@ -10,7 +10,7 @@
 #  include <glog/logging.h>
 #endif
 
-#include <iostream>
+#include <iosfwd>
 
 CCL_NAMESPACE_BEGIN
 

intern/cycles/util/string.h

@@ -4,7 +4,6 @@
 
 #pragma once
 
-#include <sstream>
 #include <string.h>
 #include <string>
 
@@ -17,10 +16,7 @@
 
 CCL_NAMESPACE_BEGIN
 
-using std::istringstream;
-using std::ostringstream;
 using std::string;
-using std::stringstream;
 using std::to_string;
 
 using OIIO::string_view;