Delete unused litstr conversion functions

These aren't called, so this takes them off the table.

hphp/runtime/base/type_conversions.h

@@ -30,7 +30,7 @@ inline bool toBoolean(short   v) { return v;}
 inline bool toBoolean(int     v) { return v;}
 inline bool toBoolean(int64_t   v) { return v;}
 inline bool toBoolean(double  v) { return v;}
-inline bool toBoolean(litstr  v) { return v && *v;}
+inline bool toBoolean(litstr  v) = delete;
 inline bool toBoolean(const StringData *v) {
   return v ? v->toBoolean() : false;
 }
@@ -51,7 +51,7 @@ inline char toByte(short   v) { return v;}
 inline char toByte(int     v) { return v;}
 inline char toByte(int64_t   v) { return v;}
 inline char toByte(double  v) { return (char)v;}
-inline char toByte(litstr  v) { return StringData(v).toByte();}
+inline char toByte(litstr  v) = delete;
 inline char toByte(const StringData *v) { return v ? v->toByte() : 0;}
 inline char toByte(CStrRef v) { return toByte(v.get());}
 inline char toByte(const ArrayData *v) { return (v && !v->empty()) ? 1 : 0;}
@@ -66,7 +66,7 @@ inline short toInt16(short   v) { return v;}
 inline short toInt16(int     v) { return v;}
 inline short toInt16(int64_t   v) { return v;}
 inline short toInt16(double  v) { return (short)v;}
-inline short toInt16(litstr  v) { return StringData(v).toInt16();}
+inline short toInt16(litstr  v) = delete;
 inline short toInt16(const StringData *v) { return v ? v->toInt16() : 0;}
 inline short toInt16(CStrRef v) { return toInt16(v.get());}
 inline short toInt16(const ArrayData *v) { return (v && !v->empty()) ? 1 : 0;}
@@ -81,7 +81,7 @@ inline int toInt32(short   v) { return v;}
 inline int toInt32(int     v) { return v;}
 inline int toInt32(int64_t   v) { return v;}
 inline int toInt32(double  v) { return (int)v;}
-inline int toInt32(litstr  v) { return StringData(v).toInt32();}
+inline int toInt32(litstr  v) = delete;
 inline int toInt32(const StringData *v) { return v ? v->toInt32() : 0;}
 inline int toInt32(CStrRef v) { return toInt32(v.get());}
 inline int toInt32(const ArrayData *v) { return (v && !v->empty()) ? 1 : 0;}
@@ -103,7 +103,7 @@ inline int64_t toInt64(double  v) {
           ? (v > std::numeric_limits<uint64_t>::max() ? 0u : (uint64_t)v)
           : (v < 0 ? (int64_t)v : std::numeric_limits<int64_t>::min()));
 }
-inline int64_t toInt64(litstr  v) { return StringData(v).toInt64();}
+inline int64_t toInt64(litstr  v) = delete;
 inline int64_t toInt64(const StringData *v) { return v ? v->toInt64() : 0;}
 inline int64_t toInt64(CStrRef v) { return toInt64(v.get());}
 inline int64_t toInt64(const ArrayData *v) { return (v && !v->empty()) ? 1 : 0;}
@@ -118,7 +118,7 @@ inline double toDouble(short   v) { return v;}
 inline double toDouble(int     v) { return v;}
 inline double toDouble(int64_t   v) { return v;}
 inline double toDouble(double  v) { return v;}
-inline double toDouble(litstr  v) { return StringData(v).toDouble();}
+inline double toDouble(litstr  v) = delete;
 inline double toDouble(const StringData *v) { return v? v->toDouble() : 0;}
 inline double toDouble(CStrRef v) { return toDouble(v.get());}
 inline double toDouble(const ArrayData *v) {
@@ -135,7 +135,7 @@ inline String toString(short   v) { return (int64_t)v;}
 inline String toString(int     v) { return (int64_t)v;}
 inline String toString(int64_t   v) { return v;}
 inline String toString(double  v) { return v;}
-inline String toString(litstr  v) { return v;}
+inline String toString(litstr  v) = delete;
 inline String toString(StringData *v) { return v ? String(v) : String("");}
 inline String toString(CStrRef v) { return toString(v.get());}
 inline String toString(const ArrayData *v) { return v ? "Array" : "";}
@@ -152,7 +152,7 @@ inline Array toArray(short   v) { return Array::Create(v);}
 inline Array toArray(int     v) { return Array::Create(v);}
 inline Array toArray(int64_t   v) { return Array::Create(v);}
 inline Array toArray(double  v) { return Array::Create(v);}
-inline Array toArray(litstr  v) { return Array::Create(v);}
+inline Array toArray(litstr  v) = delete;
 inline Array toArray(StringData *v) {
   return v ? Array::Create(v) : Array::Create();
 }
@@ -171,7 +171,7 @@ inline Object toObject(short   v) { return Variant(v).toObject();}
 inline Object toObject(int     v) { return Variant(v).toObject();}
 inline Object toObject(int64_t   v) { return Variant(v).toObject();}
 inline Object toObject(double  v) { return Variant(v).toObject();}
-inline Object toObject(litstr  v) { return Variant(v).toObject();}
+inline Object toObject(litstr  v) = delete;
 inline Object toObject(const StringData *v) { return Variant(StrNR(v)).toObject();}
 inline Object toObject(CStrRef v) { return Variant(v).toObject();}
 Object toObject(ArrayData *v);