Prevent deopt when assigning double values to typed arrays

src/conversions.h

Index: src/conversions.h
diff --git a/src/conversions.h b/src/conversions.h
index a14dc9ae1b2f04fcf072810e64c842f54081377e..03b46ca4978dff35f726b6ba29dde5df11f6d096 100644
--- a/src/conversions.h
+++ b/src/conversions.h
@@ -87,9 +87,13 @@ enum ConversionFlags {
 };
 
 
+// Perform clamping values as defined by PixelArray semantics.
+static inline uint8_t ClampToUInt8(double number);
+
 // Convert from Number object to C integer.
 static inline int32_t NumberToInt32(Object* number);
 static inline uint32_t NumberToUint32(Object* number);
+static inline uint8_t NumberToClampedUInt8(Object* number);
 
 
 // Converts a string into a double value according to ECMA-262 9.3.1