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/VersionGLSL.cpp b/src/compiler/translator/VersionGLSL.cpp
index b967065..9e593ac 100644
--- a/src/compiler/translator/VersionGLSL.cpp
+++ b/src/compiler/translator/VersionGLSL.cpp
@@ -6,6 +6,9 @@
 
 #include "compiler/translator/VersionGLSL.h"
 
+namespace sh
+{
+
 int ShaderOutputTypeToGLSLVersion(ShShaderOutput output)
 {
     switch (output)
@@ -135,3 +138,4 @@
     mVersion = std::max(version, mVersion);
 }
 
+}  // namespace sh