Update asan.md to remove PGO from supported optimization levels

Author: zacklj89

docs/sanitizers/asan.md

@@ -84,7 +84,10 @@ This article covers the information you require to enable the three workflows li
 
 ## <a name="command-prompt"></a> Use AddressSanitizer from a developer command prompt
 
-Use the **`/fsanitize=address`** compiler option in a [developer command prompt](../build/building-on-the-command-line.md#developer_command_prompt_shortcuts) to enable compiling for the AddressSanitizer runtime. The **`/fsanitize=address`** option is compatible with all existing C++ or C optimization levels (for example, `/Od`, `/O1`, `/O2`, `/O2 /GL`, and `PGO`). The option works with static and dynamic CRTs (for example, `/MD`, `/MDd`, `/MT`, and `/MTd`). It works whether you create an EXE or a DLL. Debug information is required for optimal formatting of call stacks. In the following example, `cl /fsanitize=address /Zi` is passed on the command line.
+Use the **`/fsanitize=address`** compiler option in a [developer command prompt](../build/building-on-the-command-line.md#developer_command_prompt_shortcuts) to enable compiling for the AddressSanitizer runtime. The **`/fsanitize=address`** option is compatible with existing C++ or C optimization levels (for example, `/Od`, `/O1`, `/O2`, and `/O2 /GL`). The option works with static and dynamic CRTs (for example, `/MD`, `/MDd`, `/MT`, and `/MTd`). It works whether you create an EXE or a DLL. Debug information is required for optimal formatting of call stacks. In the following example, `cl /fsanitize=address /Zi` is passed on the command line.
+
+> [!NOTE]
+Profile-guided optimization (PGO) is not supported alongside the AddressSanitizer as the AddressSanitizer should not be used in production. 
 
 The AddressSanitizer libraries (.lib files) are linked for you automatically. For more information, see [AddressSanitizer language, build, and debugging reference](asan-building.md).