[PATCH] x32 LEA patterns

[David Sehr]

This patch makes two changes relevant to LEA and x32.

1) allows the use of RIP-relative addressing in 32-bit LEA instructions
under x86-64 (ILP32 and LP64)
2) separates the size of address registers in 64-bit LEA instructions from
control by ILP32/LP64.

Tests included.  Please let me know how to proceed.

David
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