i965: rewrite the code for handling shader subroutine calls

Previously, the prog_instruction::Data field was used to map original Mesa
instructions to brw instructions in order to resolve subroutine calls.  This
was a rather tangled mess.  Plus it's an obstacle to implementing dynamic
allocation/growing of the instruction buffer (it's still a fixed size).

Mesa's GLSL compiler emits a label for each subroutine and CAL instruction.
Now we use those labels to patch the subroutine calls after code generation
has been done.  We just keep a list of all CAL instructions that needs patching
and a list of all subroutine labels.  It's a simple matter to resolve them.

This also consolidates some redundant post-emit code between brw_vs_emit.c and
brw_wm_glsl.c and removes some loops that cleared the prog_instruction::Data
fields at the end.

Plus, a bunch of new comments.

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