JIT code model - please review

[Demikhovsky, Elena]

I'm adding one more code model to solve the following problem:

In X86_64 target the Code Model is "Large". It means that address is 64-bit and IP-relative memory operand can't be used in this case.
(Because in IP-relative memory operand the displacement is 32-bit).

In order to load constant, we use 2 instructions.
movabsq $.LCPI0_0, %rcx
vmulpd  (%rcx), %ymm0, %ymm0

It happens because .LCPI0_0 is in .rodata section and instruction itself is in .text.

If I put the constant in .text, the code will look much better:
vmulpd  .LCPI0_0(%rip), %ymm0, %ymm0


I define one more Code Model called "LargeJIT", which will allows to put constants in .text.
This code model is set instead of CodeModel::Large when user defines the JITDefault mode.

Please review.

Thank you.

-        Elena



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