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/OutputGLSL.cpp b/src/compiler/translator/OutputGLSL.cpp
index 76a0012..6b2d59f 100644
--- a/src/compiler/translator/OutputGLSL.cpp
+++ b/src/compiler/translator/OutputGLSL.cpp
@@ -6,6 +6,9 @@
 
 #include "compiler/translator/OutputGLSL.h"
 
+namespace sh
+{
+
 TOutputGLSL::TOutputGLSL(TInfoSinkBase& objSink,
                          ShArrayIndexClampingStrategy clampingStrategy,
                          ShHashFunction64 hashFunction,
@@ -102,3 +105,5 @@
 
     return name;
 }
+
+}  // namespace sh