SkSplicer: always initialize fLowp

UBSAN sees copying non-bool (uninitialized) values into this bool.  Not
really a big deal, as we'll never actually use it in that case, but it's
best to just initialize it to true or false.

Change-Id: I38137d46a8aa6e6651325002b71ae5e33ff24c4a
Reviewed-on: https://skia-review.googlesource.com/7321
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>
diff --git a/src/splicer/SkSplicer.cpp b/src/splicer/SkSplicer.cpp
index 57ce670..b289871 100644
--- a/src/splicer/SkSplicer.cpp
+++ b/src/splicer/SkSplicer.cpp
@@ -302,6 +302,7 @@
             fBackup     = SkOpts::compile_pipeline(stages, nstages);
             fSplicedLen = 0;
             fSpliced    = nullptr;
+            fLowp       = false;
             // If we return early anywhere in here, !fSpliced means we'll use fBackup instead.
 
         #if defined(__aarch64__)