translator: Scope all classes with "sh".

I was seeing an odd problem with our PoolAlloc conflicting with the
glslang/Vulkan TIntermNode, so the fix was to move everything to a
separate namespace.

The bison grammars are also regenerated. No functional changes.

BUG=angleproject:1576

Change-Id: I959c7afe4c092f0d458432c07b4dcee4d39513f3
Reviewed-on: https://chromium-review.googlesource.com/408267
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
diff --git a/src/compiler/translator/ValidateOutputs.h b/src/compiler/translator/ValidateOutputs.h
index 0122ca2..0788f4e 100644
--- a/src/compiler/translator/ValidateOutputs.h
+++ b/src/compiler/translator/ValidateOutputs.h
@@ -12,6 +12,9 @@
 
 #include <set>
 
+namespace sh
+{
+
 class TInfoSinkBase;
 
 class ValidateOutputs : public TIntermTraverser
@@ -33,4 +36,6 @@
     std::set<std::string> mVisitedSymbols;
 };
 
+}  // namespace sh
+
 #endif // COMPILER_TRANSLATOR_VALIDATEOUTPUTS_H_