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, 2 insertions, 2 deletions

diff --git a/src/sksl/ir/SkSLForStatement.h b/src/sksl/ir/SkSLForStatement.h
index 4f2228a42f..f2bf880ddd 100644
--- a/src/sksl/ir/SkSLForStatement.h
+++ b/src/sksl/ir/SkSLForStatement.h
@@ -48,10 +48,10 @@ struct ForStatement : public Statement {
     // it's important to keep fSymbols defined first (and thus destroyed last) because destroying
     // the other fields can update symbol reference counts
     const std::shared_ptr<SymbolTable> fSymbols;
-    std::unique_ptr<Statement> fInitializer;
+    const std::unique_ptr<Statement> fInitializer;
     std::unique_ptr<Expression> fTest;
     std::unique_ptr<Expression> fNext;
-    std::unique_ptr<Statement> fStatement;
+    const std::unique_ptr<Statement> fStatement;
 
     typedef Statement INHERITED;
 };