Revert "Added dead variable / code elimination to skslc."

This reverts commit 113628d76176a1ab3e6719c59efff23cd10ab213.

Reason for revert: Looks to have caused https://bugs.chromium.org/p/chromium/issues/detail?id=688939

Original change's description:
> Added dead variable / code elimination to skslc.
> 
> BUG=skia:
> 
> Change-Id: Ib037730803a8f222f099de0e001fe06ad452a22c
> Reviewed-on: https://skia-review.googlesource.com/7584
> Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
> Reviewed-by: Ben Wagner <benjaminwagner@google.com>
> 

TBR=egdaniel@google.com,benjaminwagner@google.com,ethannicholas@google.com,reviews@skia.org
# Not skipping CQ checks because original CL landed > 1 day ago.
BUG=skia:

Change-Id: I85599e4ca2bc6bfd782edc163f67b64195d6ae65
Reviewed-on: https://skia-review.googlesource.com/8077
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/sksl/ir/SkSLDoStatement.h b/src/sksl/ir/SkSLDoStatement.h
index 1b233f9889..e26d3dc974 100644
--- a/src/sksl/ir/SkSLDoStatement.h
+++ b/src/sksl/ir/SkSLDoStatement.h
@@ -27,7 +27,7 @@ struct DoStatement : public Statement {
         return "do " + fStatement->description() + " while (" + fTest->description() + ");";
     }
 
-    std::unique_ptr<Statement> fStatement;
+    const std::unique_ptr<Statement> fStatement;
     std::unique_ptr<Expression> fTest;
 
     typedef Statement INHERITED;