gallium: Rename MUL_ZERO_WINS to LEGACY_MATH_RULES.

This is a clearer name for what it does than MUL_ZERO_WINS, and matches up
to the new name in shader_info.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16176>

docs/gallium/screen.rst

@@ -424,8 +424,8 @@ The integer capabilities:
   and a larger value would mean that multiple render targets are supported.
 * ``PIPE_CAP_FBFETCH_COHERENT``: Whether framebuffer fetches from the fragment
   shader can be guaranteed to be coherent with framebuffer writes.
-* ``PIPE_CAP_TGSI_MUL_ZERO_WINS``: Whether TGSI shaders support the
-  ``TGSI_PROPERTY_MUL_ZERO_WINS`` shader property.
+* ``PIPE_CAP_TGSI_LEGACY_MATH_RULES``: Whether TGSI shaders support the
+  ``TGSI_PROPERTY_LEGACY_MATH_RULES`` shader property.
 * ``PIPE_CAP_DOUBLES``: Whether double precision floating-point operations
   are supported.
 * ``PIPE_CAP_INT64``: Whether 64-bit integer operations are supported.

docs/gallium/tgsi.rst

@@ -3783,8 +3783,8 @@ Threads per block in each dimension, if known at compile time. If the block size
 is known all three should be at least 1. If it is unknown they should all be set
 to 0 or not set.
 
-MUL_ZERO_WINS
-"""""""""""""
+LEGACY_MATH_RULES
+"""""""""""""""""
 
 The MUL TGSI operation (FP32 multiplication) will return 0 if either
 of the operands are equal to 0. That means that 0 * Inf = 0. This