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/Initialize.cpp b/src/compiler/translator/Initialize.cpp
index db4ca8e..a0b35f6 100644
--- a/src/compiler/translator/Initialize.cpp
+++ b/src/compiler/translator/Initialize.cpp
@@ -16,6 +16,9 @@
 #include "compiler/translator/IntermNode.h"
 #include "angle_gl.h"
 
+namespace sh
+{
+
 void InsertBuiltInFunctions(sh::GLenum type, ShShaderSpec spec, const ShBuiltInResources &resources, TSymbolTable &symbolTable)
 {
     const TType *voidType = TCache::getType(EbtVoid);
@@ -755,3 +758,5 @@
         ext_iter->second = EBhUndefined;
     }
 }
+
+}  // namespace sh