Revert "more relaxed precision decorations for SPIR-V output"

This reverts commit 3215f1a5cab750311abf816a92ed76373f0271ab.

Reason for revert: breaking big_rrect_elliptical_corner_aa_effect on Adreno

Original change's description:
> more relaxed precision decorations for SPIR-V output
> 
> Bug: skia:
> Change-Id: Ib840187fc5ded2d00e42a8fb675e9dcf606574bb
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/201984
> Reviewed-by: Greg Daniel <egdaniel@google.com>
> Commit-Queue: Ethan Nicholas <ethannicholas@google.com>

TBR=egdaniel@google.com,ethannicholas@google.com

Change-Id: Id3368edf8442ec62300bb0e4ee639bcbec8dc33f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/202202
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
2 files changed