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/DirectiveHandler.cpp b/src/compiler/translator/DirectiveHandler.cpp
index f8081ec..073994d 100644
--- a/src/compiler/translator/DirectiveHandler.cpp
+++ b/src/compiler/translator/DirectiveHandler.cpp
@@ -12,6 +12,9 @@
 #include "common/debug.h"
 #include "compiler/translator/Diagnostics.h"
 
+namespace sh
+{
+
 static TBehavior getBehavior(const std::string& str)
 {
     const char kRequire[] = "require";
@@ -195,3 +198,5 @@
                                "version number", str, "not supported");
     }
 }
+
+}  // namespace sh