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/ValidateGlobalInitializer.h b/src/compiler/translator/ValidateGlobalInitializer.h
index c3d2a47..89b4b11 100644
--- a/src/compiler/translator/ValidateGlobalInitializer.h
+++ b/src/compiler/translator/ValidateGlobalInitializer.h
@@ -7,10 +7,15 @@
 #ifndef COMPILER_TRANSLATOR_VALIDATEGLOBALINITIALIZER_H_
 #define COMPILER_TRANSLATOR_VALIDATEGLOBALINITIALIZER_H_
 
+namespace sh
+{
+
 class TIntermTyped;
 class TParseContext;
 
 // Returns true if the initializer is valid.
 bool ValidateGlobalInitializer(TIntermTyped *initializer, const TParseContext *context, bool *warning);
 
+}  // namespace sh
+
 #endif // COMPILER_TRANSLATOR_VALIDATEGLOBALINITIALIZER_H_