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/Intermediate.cpp b/src/compiler/translator/Intermediate.cpp
index 8e6519d..9e3e455 100644
--- a/src/compiler/translator/Intermediate.cpp
+++ b/src/compiler/translator/Intermediate.cpp
@@ -15,6 +15,9 @@
 #include "compiler/translator/Intermediate.h"
 #include "compiler/translator/SymbolTable.h"
 
+namespace sh
+{
+
 ////////////////////////////////////////////////////////////////////////////
 //
 // First set of functions are to help build the intermediate representation.
@@ -380,3 +383,5 @@
             return nullptr;
     }
 }
+
+}  // namespace sh