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.h b/src/compiler/translator/VersionGLSL.h
index f03a48b..380349b 100644
--- a/src/compiler/translator/VersionGLSL.h
+++ b/src/compiler/translator/VersionGLSL.h
@@ -11,6 +11,9 @@
 
 #include "compiler/translator/Pragma.h"
 
+namespace sh
+{
+
 static const int GLSL_VERSION_110 = 110;
 static const int GLSL_VERSION_120 = 120;
 static const int GLSL_VERSION_130 = 130;
@@ -66,4 +69,6 @@
     int mVersion;
 };
 
+}  // namespace sh
+
 #endif  // COMPILER_TRANSLATOR_VERSIONGLSL_H_