Have the array type traits build an expression with type 'size_t' instead of 'int'.
Have the array type traits build an expression with type 'size_t'
instead of 'int'.

The Embarcadero spec says 'unsigned int', not 'int'. That's what
'size_t' is on Windows, but for Clang using a 'size_t' that can be
larger than int seems more appropriate.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@130653 91177308-0d34-0410-b5e6-96231b3b80d8

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