Never specify /O1

Leaving it as /O2 might improve performance.
Stops this from being spammed:
cl : command line  warning D9025: overriding '/O2' with '/O1' [D:\a\xenia-canary\xenia-canary\build\glslang-spirv.vcxproj]

/Os is implied by /O1;
https://learn.microsoft.com/en-us/cpp/build/reference/o1-o2-minimize-size-maximize-speed?view=msvc-170

src/xenia/app/premake5.lua

@@ -119,11 +119,10 @@ project("xenia-app")
       "xenia-gpu-d3d12-trace-viewer",
       "xenia-ui-window-d3d12-demo",
     })
-  filter({"configurations:Release", "platforms:Windows"})
+--  filter({"configurations:Release", "platforms:Windows"})
-    buildoptions({
+--    buildoptions({
-      "/Os",
+--      "/O1",
-      "/O1"
+--    })
-    })
 
   filter("platforms:Windows")
     -- Only create the .user file if it doesn't already exist.

src/xenia/cpu/premake5.lua

@@ -23,8 +23,7 @@ project("xenia-cpu")
 
 include("testing")
 include("ppc/testing")
-filter({"configurations:Release", "platforms:Windows"})
+--  filter({"configurations:Release", "platforms:Windows"})
-buildoptions({
+--  buildoptions({
-  "/Os",
+--    "/O1",
-  "/O1"
+--  })
-})

src/xenia/debug/ui/premake5.lua

@@ -12,12 +12,11 @@ project("xenia-debug-ui")
     "xenia-cpu",
     "xenia-ui",
   })
-  filter({"configurations:Release", "platforms:Windows"})
+--  filter({"configurations:Release", "platforms:Windows"})
-    buildoptions({
+--    buildoptions({
-      "/Os",
+--      "/O1",
-      "/O1"
+--    })
-    })
+--  filter{}
-  filter{}
   defines({
   })
   includedirs({

src/xenia/ui/d3d12/premake5.lua

@@ -10,12 +10,11 @@ project("xenia-ui-d3d12")
     "xenia-base",
     "xenia-ui",
   })
-  filter({"configurations:Release", "platforms:Windows"})
+--  filter({"configurations:Release", "platforms:Windows"})
-    buildoptions({
+--    buildoptions({
-      "/Os",
+--      "/O1",
-      "/O1"
+--    })
-    })
+--  filter {}
-  filter {}
   local_platform_files()
   files({
     "../shaders/bytecode/d3d12_5_1/*.h",

src/xenia/ui/premake5.lua

@@ -14,11 +14,10 @@ project("xenia-ui")
   local_platform_files()
   removefiles({"*_demo.cc"})
   removefiles({"windowed_app_main_*.cc"})
-  filter({"configurations:Release", "platforms:Windows"})
+--  filter({"configurations:Release", "platforms:Windows"})
-    buildoptions({
+--    buildoptions({
-      "/Os",
+--      "/O1",
-      "/O1"
+--    })
-    })
   filter("platforms:Android-*")
     -- Exports JNI functions.
     wholelib("On")

src/xenia/ui/vulkan/premake5.lua

@@ -10,12 +10,11 @@ project("xenia-ui-vulkan")
     "xenia-base",
     "xenia-ui",
   })
-  filter({"configurations:Release", "platforms:Windows"})
+--  filter({"configurations:Release", "platforms:Windows"})
-    buildoptions({
+--    buildoptions({
-      "/Os",
+--      "/O1",
-      "/O1"
+--    })
-    })
+--  filter {}
-  filter {}
   includedirs({
     project_root.."/third_party/Vulkan-Headers/include",
   })

src/xenia/vfs/premake5.lua

@@ -11,12 +11,11 @@ project("xenia-vfs")
   })
   defines({
   })
-  filter({"configurations:Release", "platforms:Windows"})
+--  filter({"configurations:Release", "platforms:Windows"})
-    buildoptions({
+--    buildoptions({
-      "/Os",
+--      "/O1",
-      "/O1"
+--    })
-    })
+--  filter {}
-  filter {}
 
   recursive_platform_files()
   removefiles({"vfs_dump.cc"})
@@ -40,4 +39,3 @@ project("xenia-vfs-dump")
     project_root,
   })
 include("testing")
-

third_party/capstone.lua

@@ -11,12 +11,11 @@ project("capstone")
     "CAPSTONE_USE_SYS_DYN_MEM",
     "_LIB",
   })
-  filter({"configurations:Release", "platforms:Windows"})
+--  filter({"configurations:Release", "platforms:Windows"})
-	buildoptions({
+--    buildoptions({
-		"/Os",
+--      "/O1",
-		"/O1"
+--    })
-	})
+--  filter {}
-  filter {}
 
   includedirs({
     "capstone",

third_party/fmt.lua

@@ -8,12 +8,11 @@ project("fmt")
   defines({
     "_LIB",
   })
-  filter({"configurations:Release", "platforms:Windows"})
+--  filter({"configurations:Release", "platforms:Windows"})
-    buildoptions({
+--    buildoptions({
-      "/Os",
+--      "/O1",
-      "/O1"
+--    })
-    })
+--  filter {}
-  filter {}
 
   includedirs({
     "fmt/include",

third_party/glslang-spirv.lua

@@ -10,12 +10,11 @@ project("glslang-spirv")
   })
   includedirs({
   })
-  filter({"configurations:Release", "platforms:Windows"})
+--  filter({"configurations:Release", "platforms:Windows"})
-    buildoptions({
+--    buildoptions({
-      "/Os",
+--      "/O1",
-      "/O1"
+--    })
-    })
+--  filter {}
-  filter {}
 
   files({
     "glslang/SPIRV/bitutils.h",

third_party/imgui.lua

@@ -11,12 +11,11 @@ project("imgui")
   includedirs({
     "imgui",
   })
-  filter({"configurations:Release", "platforms:Windows"})
+--  filter({"configurations:Release", "platforms:Windows"})
-    buildoptions({
+--    buildoptions({
-      "/Os",
+--      "/O1",
-      "/O1"
+--    })
-    })
+--  filter{}
-  filter{}
   files({
     "imgui/imconfig.h",
     "imgui/imgui.cpp",