Reland "make SkJumper stages normal Skia code"

This is a reland of 22e536e3a1a09405d1c0e6f071717a726d86e8d4

Now with fixed #include paths in SkRasterPipeline_opts.h,
and -ffp-contract=fast for the :hsw target to minimize
diffs on non-Windows Clang AVX2/AVX-512 bots.

Original change's description:
> make SkJumper stages normal Skia code
>
> Enough clients are using Clang now that we can say, use Clang to build
> if you want these software pipeline stages to go fast.
>
> This lets us drop the offline build aspect of SkJumper stages, instead
> building as part of Skia using the SkOpts framework.
>
> I think everything should work, except I've (temporarily) removed
> AVX-512 support.  I will put this back in a follow up.
>
> I have had to drop Windows down to __vectorcall and our narrower
> stage calling convention that keeps the d-registers on the stack.
> I tried forcing sysv_abi, but that crashed Clang.  :/
>
> Added a TODO to up the same narrower stage calling convention
> for lowp stages... we just *don't* today, for no good reason.
>
> Change-Id: Iaaa792ffe4deab3508d2dc5d0008c163c24b3383
> Reviewed-on: https://skia-review.googlesource.com/110641
> Commit-Queue: Mike Klein <mtklein@chromium.org>
> Reviewed-by: Herb Derby <herb@google.com>
> Reviewed-by: Florin Malita <fmalita@chromium.org>

Change-Id: I44f2c03d33958e3807747e40904b6351957dd448
Reviewed-on: https://skia-review.googlesource.com/112742
Reviewed-by: Mike Klein <mtklein@chromium.org>

1 files changed, 3 insertions, 17 deletions

diff --git a/gn/core.gni b/gn/core.gni
index bcec7c02f0..12a74ae93b 100644
--- a/gn/core.gni
+++ b/gn/core.gni
@@ -440,6 +440,8 @@ skia_core_sources = [
   "$_include/core/SkUnPreMultiply.h",
   "$_include/core/SkVertices.h",
 
+  "$_src/jumper/SkJumper.cpp",
+
   # private
   "$_include/private/SkAtomics.h",
   "$_include/private/SkChecksum.h",
@@ -527,20 +529,4 @@ skia_core_sources = [
   "$_src/pathops/SkReduceOrder.h",
 ]
 
-skia_core_sources += [
-  "$_src/jumper/SkJumper.cpp",
-  "$_src/jumper/SkJumper_stages.cpp",
-  "$_src/jumper/SkJumper_stages_lowp.cpp",
-]
-skia_core_defines = []
-if (is_win) {
-  if (host_os == "win") {
-    skia_core_sources += [ "$_src/jumper/SkJumper_generated_win.S" ]
-  } else {
-    # TODO(thakis): Enable jumper in linux->win cross builds once the
-    # assembler situation is figured out, https://crbug.com/762167
-    skia_core_defines += [ "SK_JUMPER_USE_ASSEMBLY=0" ]
-  }
-} else if (target_cpu != "wasm") {
-  skia_core_sources += [ "$_src/jumper/SkJumper_generated.S" ]
-}
+skia_core_defines = []  #  Used to be used by Chromium, but no longer.