tree 9b4ceed10a6dcd20d3d206295141e480cfd1e36d
parent a59ae6ffa3d06baaedc25883615a8e8bce67e3fe
author Jan Voung <jvoung@chromium.org> 1431967101 -0700
committer Jan Voung <jvoung@chromium.org> 1431967101 -0700

Subzero ARM: lowerArguments (GPR), basic legalize(), and lowerRet(i32, i64).

Adds basic assignment instructions, mov, movn, movw, movt,
ldr, etc. in order to copy around the first few integer
(i32, i64) arguments out of r0 - r3, and then return then.

The "mov" instruction is a bit special and can actually
be a "str" when the dest is a stack slot.

Model the Memory operand types, and the "flexible Operand2".
Add a few tests demonstrating the flexibility of the
immediate encoding.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=4076
R=stichnot@chromium.org

Review URL: https://codereview.chromium.org/1127963004