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/InitializeVariables.h b/src/compiler/translator/InitializeVariables.h
index dce1083..8083577 100644
--- a/src/compiler/translator/InitializeVariables.h
+++ b/src/compiler/translator/InitializeVariables.h
@@ -9,11 +9,14 @@
 
 #include <GLSLANG/ShaderLang.h>
 
+namespace sh
+{
 class TIntermNode;
 
 typedef std::vector<sh::ShaderVariable> InitVariableList;
 
 // This function cannot currently initialize structures containing arrays for an ESSL 1.00 backend.
 void InitializeVariables(TIntermNode *root, const InitVariableList &vars);
+}  // namespace sh
 
 #endif  // COMPILER_TRANSLATOR_INITIALIZEVARIABLES_H_