i965/fs_reg: Allocate double the number of vgrfs in SIMD16 mode

This is actually the squash of a bunch of different changes.  Individual
commit titles follow:

i965/fs: Always 2-align registers SIMD16 for gen <= 5

i965/fs: Use the register width when applying offsets

   This reworks both byte_offset() and offset() to be more intelligent.
   The byte_offset() function now supports offsets bigger than 32. The
   offset() function uses the byte_offset() function together with the
   register width and the type size to offset the register by the correct
   amount.

i965/fs: Change regs_read to be in hardware registers

i965/fs: Change regs_written to be actual hardware registers

i965/fs: Properly handle register widths in LOAD_PAYLOAD

   The LOAD_PAYLOAD instruction is a bit special because it collects a
   bunch of registers (with possibly different widths) into a single
   payload block.  Once the payload is constructed, it's treated as a
   single block of data and most of the information such as register widths
   doesn't matter anymore.  In particular, the offset of any particular
   source register is the accumulation of the sizes of the previous source
   registers.

i965/fs: Properly set writemasks in LOAD_PAYLOAD

i965/fs: Handle register widths in demote_pull_constants

i965/fs: Get rid of implicit register doubling in the allocator

i965/fs: Reserve enough registers for PLN instructions

i965/fs: Make sources and destinations interfere in 16-wide

i965/fs: Properly handle register widths in CSE

i965/fs: Properly handle register widths in register_coalesce

i965/fs: Properly handle widths in copy propagation

i965/fs: Properly handle register widths in VARYING_PULL_CONSTANT_LOAD

i965/fs: Properly handle register widths and odd register sizes in spilling

i965/fs: Don't waste a register on texture lookups for gen >= 7

   Previously, we were waisting a register in SIMD16 mode because we could
   only allocate registers in pairs.  Now that we can allocate and address
   odd-sized registers, let's get rid of this special-case.

Signed-off-by: Jason Ekstrand <[email protected]>
Reviewed-by: Matt Turner <[email protected]>

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