GS/Shaders: Try to fix Warning X4000: FxaaPixelShader potentially uninitialized variable.

[skip-ci]

.github/ISSUE_TEMPLATE/emu_bug_report.yaml

@@ -66,10 +66,6 @@ body:
 
         Performance issues as a result of not meeting our hardware requirements are not valid.
 
-        Please read our known issues pages for AMD and Intel drivers.
-        - [Intel Drivers](https://github.com/PCSX2/pcsx2/wiki/OpenGL-and-Intel-GPUs-All-you-need-to-know).
-        - [AMD Drivers](https://github.com/PCSX2/pcsx2/wiki/OpenGL-and-AMD-GPUs---All-you-need-to-know).
-
         We are **not** accepting issues related to the **libretro** core. The libretro core is being maintained separately at this time
   - type: input
     id: rev

bin/resources/shaders/common/fxaa.fx

@@ -160,10 +160,7 @@ float FxaaLuma(float4 rgba)
 
 float4 FxaaPixelShader(float2 pos, FxaaTex tex, float2 fxaaRcpFrame, float fxaaSubpix, float fxaaEdgeThreshold, float fxaaEdgeThresholdMin)
 {
-	float2 posM;
-	posM.x = pos.x;
-	posM.y = pos.y;
-
+	float2 posM = pos;
 	float4 rgbyM = FxaaTexTop(tex, posM);
 	rgbyM.w = RGBLuminance(rgbyM.xyz);
 	#define lumaM rgbyM.w
@@ -186,9 +183,10 @@ float4 FxaaPixelShader(float2 pos, FxaaTex tex, float2 fxaaRcpFrame, float fxaaS
 	float rangeMaxScaled = rangeMax * fxaaEdgeThreshold;
 	float rangeMaxClamped = max(fxaaEdgeThresholdMin, rangeMaxScaled);
 
-	bool earlyExit = range < rangeMaxClamped;
 	#if (FxaaEarlyExit == 1)
-	if(earlyExit) { return rgbyM; }
+	// Potential optimization, early exit.
+	if (range < rangeMaxClamped)
+		return rgbyM;
 	#endif
 
 	float lumaNW = FxaaLuma(FxaaTexOff(tex, posM, int2(-1,-1), fxaaRcpFrame.xy));

pcsx2/ShaderCacheVersion.h

@@ -3,4 +3,4 @@
 
 /// Version number for GS and other shaders. Increment whenever any of the contents of the
 /// shaders change, to invalidate the cache.
-static constexpr u32 SHADER_CACHE_VERSION = 63;
+static constexpr u32 SHADER_CACHE_VERSION = 64;