Temporarily disable FP16 altogether, which makes PSSL shader compilation a lot happier. Need to figure out how to make the FP16 utility function definitions work without the shader compiler complaining about duplicate declarations.

Packages/com.unity.postprocessing@3.2.2/PostProcessing/Runtime/Effects/Upscaling/ASR/Shaders/ffxm_fsr2_compute_luminance_pyramid_pass.compute

@@ -1,6 +1,6 @@
 #pragma kernel main
 
-#pragma multi_compile __ FFXM_HALF
+//#pragma multi_compile __ FFXM_HALF
 #pragma multi_compile __ FFXM_FSR2_OPTION_LOW_RESOLUTION_MOTION_VECTORS
 #pragma multi_compile __ FFXM_FSR2_OPTION_JITTERED_MOTION_VECTORS
 #pragma multi_compile __ FFXM_FSR2_OPTION_INVERTED_DEPTH

Packages/com.unity.postprocessing@3.2.2/PostProcessing/Runtime/Effects/Upscaling/ASR/Shaders/ffxm_fsr2_fs.shader

@@ -14,7 +14,7 @@ Shader "TND/ASR/ffx_fsr2_fs"
             #pragma target 4.5
             //#pragma enable_d3d11_debug_symbols
             
-            #pragma multi_compile __ FFXM_HALF
+            //#pragma multi_compile __ FFXM_HALF
             #pragma multi_compile __ UNITY_FFXM_TEXTURE2D_X_ARRAY
 
             #include "ffxm_fsr2_common.cginc"
@@ -34,7 +34,7 @@ Shader "TND/ASR/ffx_fsr2_fs"
             #pragma target 4.5
             //#pragma enable_d3d11_debug_symbols
 
-            #pragma multi_compile __ FFXM_HALF
+            //#pragma multi_compile __ FFXM_HALF
             #pragma multi_compile __ FFXM_FSR2_OPTION_HDR_COLOR_INPUT
             #pragma multi_compile __ FFXM_FSR2_OPTION_LOW_RESOLUTION_MOTION_VECTORS
             #pragma multi_compile __ FFXM_FSR2_OPTION_JITTERED_MOTION_VECTORS
@@ -58,7 +58,7 @@ Shader "TND/ASR/ffx_fsr2_fs"
             #pragma target 4.5
             //#pragma enable_d3d11_debug_symbols
 
-            #pragma multi_compile __ FFXM_HALF
+            //#pragma multi_compile __ FFXM_HALF
             #pragma multi_compile __ FFXM_FSR2_OPTION_SHADER_OPT_BALANCED
             #pragma multi_compile __ FFXM_FSR2_OPTION_SHADER_OPT_PERFORMANCE
             #pragma multi_compile __ FFXM_FSR2_OPTION_LOW_RESOLUTION_MOTION_VECTORS
@@ -83,7 +83,7 @@ Shader "TND/ASR/ffx_fsr2_fs"
             #pragma target 4.5
             //#pragma enable_d3d11_debug_symbols
 
-            #pragma multi_compile __ FFXM_HALF
+            //#pragma multi_compile __ FFXM_HALF
             #pragma multi_compile __ FFXM_FSR2_OPTION_SHADER_OPT_BALANCED
             #pragma multi_compile __ FFXM_FSR2_OPTION_SHADER_OPT_PERFORMANCE
             #pragma multi_compile __ FFXM_FSR2_OPTION_REPROJECT_USE_LANCZOS_TYPE

Packages/com.unity.postprocessing@3.2.2/PostProcessing/Runtime/Effects/Upscaling/ASR/Shaders/ffxm_fsr2_lock_pass.compute

@@ -1,6 +1,6 @@
 #pragma kernel main
 
-#pragma multi_compile __ FFXM_HALF
+//#pragma multi_compile __ FFXM_HALF
 #pragma multi_compile __ FFXM_FSR2_OPTION_LOW_RESOLUTION_MOTION_VECTORS
 #pragma multi_compile __ FFXM_FSR2_OPTION_JITTERED_MOTION_VECTORS
 #pragma multi_compile __ FFXM_FSR2_OPTION_INVERTED_DEPTH