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/SimplifyLoopConditions.h b/src/compiler/translator/SimplifyLoopConditions.h
index b8802aa..968089d 100644
--- a/src/compiler/translator/SimplifyLoopConditions.h
+++ b/src/compiler/translator/SimplifyLoopConditions.h
@@ -11,6 +11,8 @@
 #ifndef COMPILER_TRANSLATOR_SIMPLIFYLOOPCONDITIONS_H_
 #define COMPILER_TRANSLATOR_SIMPLIFYLOOPCONDITIONS_H_
 
+namespace sh
+{
 class TIntermNode;
 class TSymbolTable;
 
@@ -19,5 +21,6 @@
                             unsigned int *temporaryIndex,
                             const TSymbolTable &symbolTable,
                             int shaderVersion);
+}  // namespace sh
 
 #endif  // COMPILER_TRANSLATOR_SIMPLIFYLOOPCONDITIONS_H_