Drop unnecessary ';' after namespace

The ';' was introduced in 237642. With it in place, we get a large number of
warnings in -pedantic mode.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237667 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/IR/GlobalValue.h

@@ -30,7 +30,7 @@ class Module;
 
 namespace Intrinsic {
   enum ID : unsigned;
-};
+}
 
 class GlobalValue : public Constant {
   GlobalValue(const GlobalValue &) = delete;