Fix for possible overflow in the resampler (can prevent some audio clicks)

Comment fixes

Core/HW/StereoResampler.cpp

@@ -165,7 +165,13 @@ void StereoResampler::Clear() {
 }
 
 inline int16_t MixSingleSample(int16_t s1, int16_t s2, uint16_t frac) {
-	return s1 + (((s2 - s1) * frac) >> 16);
+	int32_t value = s1 + (((s2 - s1) * frac) >> 16);
+	if (value < -32767)
+		return -32767;
+	else if (value > 32767)
+		return 32767;
+	else
+		return (int16_t)value;
 }
 
 // Executed from sound stream thread, pulling sound out of the buffer.

Core/MIPS/MIPS.h

@@ -194,7 +194,8 @@ public:
 
 	// Register-allocated JIT Temps don't get flushed so we don't reserve space for them.
 	// However, the IR interpreter needs some temps that can stick around between ops.
-	// Can be indexed through r[] using indices 192+.
+	// Can be indexed through r[] using indices 192+, thanks to predictable struct layout.
+	// Unfortunately, UBSAN isn't too happy about these.
 	u32 t[16];     //192
 
 	// If vfpuCtrl (prefixes) get mysterious values, check the VFPU regcache code.

SDL/README.TXT

@@ -25,3 +25,17 @@ Running with valgrind
 Here's an example where we both use suppressions, and generate new ones (that you can then take from suppressions.log and simplify and copy to valgrind-wsl2.supp):
 
 > valgrind --suppressions=SDL/valgrind-wsl2.supp --gen-suppressions=all --log-file=suppressions.log build/PPSSPPSDL
+
+Running with ASAN
+=================
+
+./b.sh --sanitize
+
+build/PPSSPPSDL.app/Contents/MacOS/PPSSPPSDL
+
+Running with UBSAN
+==================
+
+./b.sh --sanitize --sanitizeub
+
+UBSAN_OPTIONS=print_stacktrack=true build/PPSSPPSDL.app/Contents/MacOS/PPSSPPSDL