rename confusing lowp guard

Change-Id: I346429015e5f902b0a35663e140bb9a025c4220e
Reviewed-on: https://skia-review.googlesource.com/34680
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>
diff --git a/public.bzl b/public.bzl
index d791473..dbe2d49 100644
--- a/public.bzl
+++ b/public.bzl
@@ -668,7 +668,7 @@
     # Should remove after we update golden images
     "SK_WEBP_ENCODER_USE_DEFAULT_METHOD",
     # Experiment to diagnose image diffs in Google3
-    "SK_DISABLE_SSSE3_RUNTIME_CHECK_FOR_LOWP_STAGES",
+    "SK_JUMPER_DISABLE_8BIT",
 ]
 
 ################################################################################
diff --git a/src/jumper/SkJumper.cpp b/src/jumper/SkJumper.cpp
index e1888a8..8d773b0 100644
--- a/src/jumper/SkJumper.cpp
+++ b/src/jumper/SkJumper.cpp
@@ -30,7 +30,7 @@
 static const int kNumStages = SK_RASTER_PIPELINE_STAGES(M);
 #undef M
 
-#ifndef SK_DISABLE_SSSE3_RUNTIME_CHECK_FOR_LOWP_STAGES
+#ifndef SK_JUMPER_DISABLE_8BIT
     #if 0 && !__has_feature(memory_sanitizer) && (defined(__x86_64__) || defined(_M_X64))
         #include <atomic>
 
@@ -334,7 +334,7 @@
     return kPortable;
 }
 
-#ifndef SK_DISABLE_SSSE3_RUNTIME_CHECK_FOR_LOWP_STAGES
+#ifndef SK_JUMPER_DISABLE_8BIT
     static const SkJumper_Engine kNone = {
     #define M(stage) nullptr,
         { SK_RASTER_PIPELINE_STAGES(M) },
@@ -380,7 +380,7 @@
 #endif
 
 const SkJumper_Engine& SkRasterPipeline::build_pipeline(void** ip) const {
-#ifndef SK_DISABLE_SSSE3_RUNTIME_CHECK_FOR_LOWP_STAGES
+#ifndef SK_JUMPER_DISABLE_8BIT
     gChooseLowpOnce([]{ gLowp = choose_lowp(); });
 
     // First try to build a lowp pipeline.  If that fails, fall back to normal float gEngine.