i965/vec4: do not predicate scratch writes for BRW_OPCODE_SEL instructions
i965/vec4: do not predicate scratch writes for BRW_OPCODE_SEL instructions

The dst is always written, in this case the predicate is only used to select
the value to write, so if we are spilling the dst we always want to write
whatever value we selected to scratch.

Reviewed-by: Francisco Jerez <5906ff32bdd9fd8db196f6ba5ad3afd6f9257ea5@riseup.net>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler