Prevent deopt when assigning double values to typed arrays

src/ia32/stub-cache-ia32.cc

Index: src/ia32/stub-cache-ia32.cc
diff --git a/src/ia32/stub-cache-ia32.cc b/src/ia32/stub-cache-ia32.cc
index 27d28868f393eeb4878750b349d8c7d9941b592b..31bc58ddf5a914185781584ef3ebf48b110d335a 100644
--- a/src/ia32/stub-cache-ia32.cc
+++ b/src/ia32/stub-cache-ia32.cc
@@ -3546,14 +3546,7 @@ MaybeObject* ExternalArrayStubCompiler::CompileKeyedStoreStub(
   // ecx: base pointer of external storage
   switch (array_type) {
     case kExternalPixelArray:
-      {  // Clamp the value to [0..255].
-        NearLabel done;
-        __ test(ecx, Immediate(0xFFFFFF00));
-        __ j(zero, &done);
-        __ setcc(negative, ecx);  // 1 if negative, 0 if positive.
-        __ dec_b(ecx);  // 0 if negative, 255 if positive.
-        __ bind(&done);
-      }
+      __ ClampUInt8(ecx);
       __ mov_b(Operand(edi, ebx, times_1, 0), ecx);
       break;
     case kExternalByteArray: