Rewrite decodeURL as builtin function, remove now unused runtime functions.

src/runtime/runtime.h

Index: src/runtime/runtime.h
diff --git a/src/runtime/runtime.h b/src/runtime/runtime.h
index 1df45f5fa29a885b0105fb055e9ac2a1d1e0c9f4..b34689e906fb48c271bf86fbfb1ca8255db8a274 100644
--- a/src/runtime/runtime.h
+++ b/src/runtime/runtime.h
@@ -827,8 +827,6 @@ namespace internal {
   F(StringToLowerCase, 1, 1)              \
   F(StringToUpperCase, 1, 1)              \
   F(StringTrim, 3, 1)                     \
-  F(TruncateString, 2, 1)                 \
-  F(NewString, 2, 1)                      \
   F(StringLessThan, 2, 1)                 \
   F(StringLessThanOrEqual, 2, 1)          \
   F(StringGreaterThan, 2, 1)              \
@@ -839,10 +837,6 @@ namespace internal {
   F(StringCharFromCode, 1, 1)             \
   F(StringCharAt, 2, 1)                   \
   F(ExternalStringGetChar, 2, 1)          \
-  F(OneByteSeqStringGetChar, 2, 1)        \
-  F(OneByteSeqStringSetChar, 3, 1)        \
-  F(TwoByteSeqStringGetChar, 2, 1)        \
-  F(TwoByteSeqStringSetChar, 3, 1)        \
   F(StringCharCodeAt, 2, 1)
 
 #define FOR_EACH_INTRINSIC_SYMBOL(F) \