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, 0 insertions, 36 deletions

diff --git a/src/sksl/ir/SkSLNop.h b/src/sksl/ir/SkSLNop.h
deleted file mode 100644
index 6b13e140b6..0000000000
--- a/src/sksl/ir/SkSLNop.h
+++ /dev/null
@@ -1,36 +0,0 @@
-/*
- * Copyright 2016 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifndef SKSL_NOP
-#define SKSL_NOP
-
-#include "SkSLStatement.h"
-#include "SkSLSymbolTable.h"
-
-namespace SkSL {
-
-/**
- * A no-op statement that does nothing.
- */
-struct Nop : public Statement {
-    Nop()
-    : INHERITED(Position(), kNop_Kind) {}
-
-    virtual bool isEmpty() const override {
-        return true;
-    }
-
-    SkString description() const override {
-        return SkString(";");
-    }
-
-    typedef Statement INHERITED;
-};
-
-} // namespace
-
-#endif